Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b84c66fbcf1ad4…

MALICIOUS

PDF

73.6 KB Created: 2021-09-05 11:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3dae3cd994b4c9d02d7f09f855834fa3 SHA-1: e7c73ab948d33a2d6e24ae8cb831cb718cde3a03 SHA-256: a8b84c66fbcf1ad4f080efa86cf487b6161117dc4e0cb046a3542c2fcf96f42b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778af7b1fc0---nisuruwefotipoxowe.pdf In PDF document text
    • http://lacasedescaraibes.fr/file/66563962090.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/63710918a552e03a61721c3084268524/wekudopoxekugo.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/20177ad9728ff987506557c19c67ac76/guporupujezonezulotuf.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb07821e356---guromubepubode.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608816a340977---lamojetogusisuti.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92092036beafa7f7d07b4618aff7ed24/wepipamudawu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612a54f4bb333---dozuxoxilutidas.pdfIn PDF document text
    • http://insureatkk.com/ckfinder/userfiles/files/towutoturi.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d7d2458080a31fe7ffea6b0260dbeb72/joledojirebamopikuxodix.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0881074f55---wibosinibefejalato.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/53451732.pdfIn PDF document text
    • https://2acontractor.it/images/file/56850624640.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a855c22c79---waruvijejuseb.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f47dcca54---24094507267.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/27840877029.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/rumagubukugi.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/sagesalegorajilaxurozonax.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/12075133212.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/f8q7tnmpsk4eqj094mrv40reoo/85876828182.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08aeae7a9b---sitisexamuju.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/94970559803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=verb+with+singular+and+plural+nouns+worksheetPDF 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_off0000ba98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA98 17624 bytes
SHA-256: 3b3c237677016df31b554fa3ddb143b33f485a0476d939161593ecd7d204039a
font_01_sfnt_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 11060 bytes
SHA-256: 5eed2ba786b6452563300f99e373b1a41f5df23303cbdedc0f079e78b0c64e0d
font_02_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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