Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19a85afe5c5ad6c…

MALICIOUS

PDF

90.2 KB Created: 2021-07-09 21:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3cfc5284b72a65743bb2141c27c2293e SHA-1: 053a751b909ab35a6f04e5dfe6b7d82d4274460b SHA-256: d19a85afe5c5ad6c08c85af22b9cfe67054c6ee950c136f849cf4210ecfc77e7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_CLICKFIX' heuristic suggests a social engineering attack designed to trick the user into executing a command, likely to download and execute a secondary payload. The presence of numerous external URLs, many pointing to compromised WordPress sites, further supports this. No scripts were extracted, but the PDF structure and heuristics point towards exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=csgo+launch+options+for+max+fps PDF link annotation
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/dqevbtdc3p9385fntsdilg9qd4/49886898013.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/1h6ogmbeinn8mp5qs52cavv160/kewuwul.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/a2b339416971d03949380d46f4ae6c64/27057278454.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c1bcca93---20509457484.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609262f2d8f76---sejaneku.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/s3ik6ig1cu57hj8g6jdac9chc8/47325331498.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/46917733211.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/fotukotizogituk.pdfIn PDF document text
    • http://landpas.pl/upload/file/36051510167.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/21972926853.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa45cd0ec7---notetofepef.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094114fd4767---zogadudesubesidilumug.pdfIn PDF document text
    • http://esistore.de/userfiles/file/8214726061.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/17979709989.pdfIn PDF document text
    • http://firegallery.ru/img/upload/wadadi.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec79ece90---lurakukanitesuke.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d686eab56ea---sunizetiton.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/worap.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/19542019083.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/65cf23e5daff3e91d326f476abcfe9d9/wimipowu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4133e32903---37102678960.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/22269026571.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/u9lj5plfu7vd8c0bhpc59dqms2/74517742417.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/fc8pda59ls14st04p1ibv3h16c/wozafavapewelubowojojiv.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160866f430ba17---ditipemaxobakuwubaxaf.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a212d0c377a---denezisudolawobujoru.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720001c3a49---lubogawurupaxozunu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001130b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130B 17736 bytes
SHA-256: 213c911178191f319e2a9382c8758c303380f3c1fb99771a1a74134275dd29b7
font_02_sfnt_off00014202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14202 11028 bytes
SHA-256: 2861020c0de9a48f6f3c17f160cdd1dd41ecb90f86c43bf84232b262c0e7f59d

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