Malicious PDF — malware analysis report

Static analysis result for SHA-256 1843f3ecc346875c…

MALICIOUS

PDF

118.9 KB Created: 2021-06-30 16:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: da97211a74160515d41f8aed24b5282f SHA-1: 4f9b9c2d083eeb96e5d6ba9ed0dbcfc48c6675c7 SHA-256: 1843f3ecc346875cc1173b383ddaf3f9c448839b3d1b4c0b522959cccc8e0504
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 critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs the user to execute commands, likely to download and run a second-stage payload. The numerous embedded URLs point to compromised WordPress sites and link farms, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://archism.ru/uplcv?utm_term=what+is+the+shift+key+on+a+computer+keyboard PDF link annotation
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cde4d5fee---64441062444.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/3jc41rhiu64fmrl4fkoirrfbe5/bujoneso.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/wugexexeromaside.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6239c4432a43f2f2c2c5d9fd6137fb3f/6913121408.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/vegarixefezefexixasu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993a91a2f4c---niremuju.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/taruxabiwironexu.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885a060b28d---45768228349.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/15b9f53b8072c8bf6b03c5c988542e18/91618276432.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb1921ee10---54175526516.pdfIn PDF document text
    • http://orrizon.ru/images/file/sazalivupabukatozu.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/37044147256.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a854ef4b8ba---jonogolapogofe.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/fowirutofaxa.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/dazoregajazimepapege.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/80371029680.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/fcbe9a95990ad96417f6fbb0da6112e3/25839784186.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/pefab.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb06a40a012---vonavofekufis.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9972248809---sovukemafopiv.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/98749158775.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/pub3rp6h2s5d0r2scacb6k1b62/96794449585.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1887109c55bcd4f046fee7ded827ba94/21717495188.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1b4920151---notepiwa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A81 11276 bytes
SHA-256: b961309d2cdcebe3bab1b0bae43678de3270da2e5780c3765227eb89d3b651ec
font_01_sfnt_off000184a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CB4 18844 bytes
SHA-256: 29d15684da0161a92b8c54bdb23fa092439642b8834e24cfbba266d6e3ac8091

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