Malicious PDF — malware analysis report

Static analysis result for SHA-256 f004b12be37b6171…

MALICIOUS

PDF

78.8 KB Created: 2021-09-12 15:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 153e12a826b92221e823ffd672c6dc83 SHA-1: f30360d93c169efe7d303df57e91fd279fbcff92 SHA-256: f004b12be37b6171d0d25d2cc46663e1f9b7d164d917764896198f0264703fca
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further payloads or visiting phishing sites. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=download+fifty+shades+of+grey+1080p PDF link annotation
    • http://tokyo-sanritsu.com/userfiles/file/pawukipotasogutopusurusur.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/55389111719.pdfIn PDF document text
    • http://sdes.in/uploads/82368555422.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8ec410e283ca74a1f337b54237cf4232/funomufinepulagofilixesej.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/24434022062.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/88a1256e330106e1c372ed12ed3ab5b9/28835868219.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/bawiranidoguwepe.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/mewaxipifewibaninuvel.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/64679182161.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393e9de5d66---tibedabubujukuzes.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/fosobazokebujirixizotu.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/90080782510.pdfIn PDF document text
    • http://watch62.ru/files/files/melokovalirajerugavigel.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/4213988427.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/nanisipelukureku.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/bafusumuxepadizaluro.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/luxerilan.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/8229847238.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/rolasanejogububelebuxavo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161300bbb58326---bokixanix.pdfIn PDF document text
    • https://fivetc.net/uploads/files/78917284264.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/939d24477af74656cface0e1eb6ab1a6.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/keroregij.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/faseju.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c068e58688---1191250741.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_off0000c632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC632 19812 bytes
SHA-256: 9fec3eba25cc7d8ec8af320cff32713bd34f5532cb04781c9782d6abfc2fa9f4
font_01_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CE 11360 bytes
SHA-256: d656ac99280f1c2fc5b1cddc96306b8f2f1262379d777d4c020a601f7b0da672