Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcf62cdea47b7e3…

MALICIOUS

PDF

83.8 KB Created: 2021-06-27 07:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfe4885c1d8e2b5cb4c87958c26880a5 SHA-1: f1bc4d8a1e71c1b4eafd41310b3e9657b80a4d76 SHA-256: bfcf62cdea47b7e3a5d41927c7b020c62767b18f68a55b0e9f34a0744ea7ed5e
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'LOLBin run command' heuristic suggests attempts to execute commands, though the exact payload is not discernible from the provided evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5ba99dbfd8f1bc7c6a644cdbcd5b379a/24374147121.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/l5oirkek5jk3rgidqkjasoq28q/sawufonobefop.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/36a794c62a44d365b927c723b1bc8884/kipabuginukepep.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813d869054c---dezikegeb.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56c208edd---12519555529.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e8f86a3874fc39162bd4c9e8b6a041a6/baleritekopekuzi.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ed810c13---mobudobod.pdf
    • http://ansing.nl/userfiles/file/95596799994.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/9c3ab7db7790c61330d06a1f72b922ac/66627306593.pdf
    • http://www.firengo.com/userfiles/files/sorifevi.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73d3a9fe3---gumozevusudus.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cf5aaa1b1---51289764936.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/692831ecd365d2f555350f73113fa586/sogizoluwamokukigu.pdf
    • http://tpdw.pl/userfiles/file/44293462279.pdf
    • http://drironcat.com/images/file/zepiluparabano.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/eb1caaf0d055b1cff66c75e20943687a/58801071862.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5da9ae8068---tugowuluze.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160852cdfabf3e---1809269394.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/ec339a664ed121cf9b33b9537e100cae/zivuxasosebi.pdf
    • https://aulacvn.com/upload/fck/file/11313892705.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b8bfcea71---99988864035.pdf
    • http://b-solutions.net/userfiles/file/xelusoremisetorefe.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba01ef38acc---80734796750.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=record+only+game+audio
    • 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_off0000e5c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 16792 bytes
font_01_sfnt_off0000fddb.bin
9c90679f927d75606a87e5503686ad7ae53b60d850d6c344c871bce5a167c2a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDB 16840 bytes
font_02_sfnt_off000129e8.bin
c73b481dafa74ba344af689e2c105ea1771251edb67044f01e182bc5b9ef02b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129E8 10708 bytes

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