Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c43f0c635e015a8…

MALICIOUS

PDF

90.9 KB Created: 2021-09-10 05:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a708c56363253250b4d8dd46d9d427f6 SHA-1: f037906f039cd7238200c7d445f42bfa63f56c37 SHA-256: 3c43f0c635e015a84d7f638e060bad11b56765b789984291061d9f22db6be508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=vni+font+for+android PDF link annotation
    • http://banquat.com/userfiles/files/77789620899.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/51720867613.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/52088521982.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/19655604959.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/35a1e22e26192d8145d7dff0df636fa4/sovefivere.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/tipebedibuza.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/kanizusek.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613673f3132fe---60550074517.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/evawisojureregopajuri.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130747b319ef---1257995867.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/12493432354.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/89797298481.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/12670857473.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/rubivixomatinek.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210909150259.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/85212455924.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133029077d88---kazagajakazalumaxosimeb.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/78e721b65d4dbd17e129e62d600c43dc/varekakufasix.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xoxevogono.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613668ee93a53---zusamufaxevujafuditi.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/gigokavunama.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/82095666492.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/posaserog.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000119b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x119B0 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 23324 bytes
SHA-256: 23ca9ce335b9b1a33c553f6e578ef9174fdf5b1d9d814ec058b9d70cc580f537
font_02_sfnt_off00012fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 9968 bytes
SHA-256: 0b6b50cc9a5eafb28b7b4284d982cd4a57c3f772ba6c6c157a01744b83ea2a8b
font_03_sfnt_off000145cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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