Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34f2b2c2885c9fa…

MALICIOUS

PDF

88.6 KB Created: 2021-07-08 07:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 943940e74445624fea97388d9f5655b8 SHA-1: 4f030b0badf5de0fe7027bb8957790d1a95686ee SHA-256: a34f2b2c2885c9fa40617172b73760fcec2a19c6267fbe91d343d792b981f299
204 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that tricks users into executing commands, likely to download and execute a second-stage payload. The embedded URLs and link farms suggest attempts to redirect users to malicious content or download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • 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://philabc.ru/uplcv?utm_term=why+is+my+document+printing+blank
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a304ee1b9ed---xuvowezab.pdf
    • https://zebcom.in/userfiles/file/35535981795.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/455c57866b149d4a1c5779637bbc81a5/85230173409.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/u3lrp4r8ktc1fbe1flddbjl8i5/69861723805.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/nurezapipikumugiropebape.pdf
    • http://windmill-bv.com/userfiles/files/sikej.pdf
    • https://pet-fashion.ro/mm/file/mikurafovura.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa26905bc---jopoxafajazozoma.pdf
    • http://clingac.com/d/files/laruzitopibodo.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb63f74a5a---legibupizoxare.pdf
    • https://contactfm.be/userfiles/files/82700163695.pdf
    • https://zahnersatz.pl/userfiles/files/moveduwiru.pdf
    • https://pet-fashion.ro/mm/file/94330646540.pdf
    • http://mmbc.cz/_data/user_files/file/89109467256.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff8e97f29---tusavuzalufogifaxitugi.pdf
    • http://gayaarchi.com/userfiles/file/20210518055458.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbe2cce10---87753390097.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afb87752da---58362315801.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/pududirisopoxetebexetoj.pdf
    • http://bhk-aindling.com/userfiles/files/60433810232.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b696ebdf84---powatexirekuruze.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/o8uducmtlvr510jgs3ehrtdcn5/jilis.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c426abb9565---63372541264.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c957cc0499---palemat.pdf
    • 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_off0000f654.bin
b2309ff8d1bc6e5c974d50b905b62c072ad92eb903c677227cb7d4c6d25cecc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 11400 bytes
font_01_sfnt_off000110a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 16792 bytes
font_02_sfnt_off000128b4.bin
729535e4fad92bd300d3372654e6256c6d432505782b82c27726c2f5b36017a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128B4 17220 bytes

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