Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3100329bd3f8404…

MALICIOUS

PDF

82.6 KB Created: 2021-07-30 01:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83caae513deb226f517ccb59965a8c3b SHA-1: dff7191204ac112ef2432b9018191c9a5ad1662a SHA-256: f3100329bd3f8404ae895a34c3b6e4feffaa8e6b2dc674ec0c333f4099d8aeca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites hosting PDF files, suggesting a link farm designed to redirect users to malicious content. The presence of UTM parameters in one URL further supports a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/4416e15f3b7230f725465c708b6eab5a/wosonisodine.pdf In PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607864db32a7e---60197169934.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/810cd52e6b4148612001788f3a7cdcec/xibivawefefale.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/4fc704b1f6673c4cc14130acc6b37799/zajifufukuwonanen.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875e45d1e3a---12632626370.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae23e4c8ce---fuxiwinazaligure.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/wabaxazixofatufuwefusi.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/28978350795.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987643ba61a---gezokenibekavitew.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/47883461398.pdfIn PDF document text
    • http://www.puhito.hu/uploads/11344763329.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/825caff6974ddee0d371677af08acb06/18062190928.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/mujawomutonolobupumo.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/nitoz.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/tilarura.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/9psk3bjn7dcl4k76i40kpa3vd2/24782892820.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/xujewopob.pdfIn PDF document text
    • http://cutskytools.com/d/files/wogegumexugarobig.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b4218aba---52661836148.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/29433604770.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/vifogarevuv.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/wojudirikirekawedune.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/33962513955.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2dd6bf271---70037599300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=do+i+need+to+download+faceit+anti+cheatPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 10392 bytes
SHA-256: 55731b98686e16b7d03f29ae4b79ea79d13e1ef403ff36bddc9b49567b4a5e63
font_01_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 16980 bytes
SHA-256: a0e9ac80e79bb855b587fd9a476e67a43d253e65750af05f38712330206b3e7c
font_02_sfnt_off00012491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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