Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f5a8e1908195ff…

MALICIOUS

PDF

86.5 KB Created: 2021-07-13 00:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb69925f9bdd2e4f3ef1941dfb054fef SHA-1: fb8f36f30fe5906f7e9d85415fb0d52e905b9c31 SHA-256: 41f5a8e1908195ffafd33ab38b413c9f32ee014f154ca82be20ed40677dc9cd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV both strongly indicate maliciousness. The PDF contains a link farm pointing to numerous domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, suggesting an attempt to distribute malware or conduct phishing. The document body is unreadable, but the heuristic firings confirm the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://musorcentrum.hu/files/article/file/batotonomo.pdf
    • http://108homed.com/userfiles/files/nejolaririsi.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93fbc9d20---35893942691.pdf
    • http://mateuszkucharski.pl/admin/file/zobukikujijiwenigekimu.pdf
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/17828199672.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1c05c610---ralubafipidow.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/54710911499.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085583a01842---dusapab.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/40ba6f46a9f0adfd6dcb3522314cecab/xewav.pdf
    • http://eraucheta.ru/uploads/file/4687081125.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff3c5ba55---47765362479.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f18596e7f---59169062985.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/72198196693.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0ff060997d29d958d56dfd43ba7e86ff/58430353113.pdf
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/17577492298.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf9200dfa---29243358068.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5b8ed49e01581fe49c73c2516df86fff/bidilukovos.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7066385386be6925b1440eaf8815e7a1/86987967798.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12d201657---48255358118.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/gejilojer.pdf
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/44958228972.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a1b9de0be97aa9133cc2ee95fcbfc2ee/kasunu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=types+of+fixed+deposit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef81.bin
f702268f58a5e4350268f76f3ab71d6749aded7fbcc0450c456214fbf637d014
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 17628 bytes
font_01_sfnt_off00011ded.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 16792 bytes
font_02_sfnt_off00013604.bin
a3bb754bc2755533cd805dab003f50f7f4495cbc1f9315b8c35c4a724bca5b47
pdf-font-stream PDF embedded font (sfnt) at offset 0x13604 10256 bytes