Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7c7e7eeea2c2d8…

MALICIOUS

PDF

83.8 KB Created: 2021-06-27 19:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b7fd1ea4edb533561bf38a5637b409be SHA-1: 1ce5abb184511a011b0515fe93ef5671d9a4a69d SHA-256: 5c7c7e7eeea2c2d821ddc514c325c2ee3f1b77dd11b039a93be926fd889de3f8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised CMS upload directories. This suggests a phishing or redirection scheme designed to lead users to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ede04b80---55164668545.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vvlap3l8e6rvotko844vmgkb56/77474065605.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7116699ef3c43280a1793ed1aabd03dd/42225069020.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093a8cc440c5---dijatikizopevopexufomawi.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1ed10527---dafikevabaxekarod.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/n1r6vitjl50arn1ciijk6lfvvj/walizudugelul.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/12727561654.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7206d214f---22081469278.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/be6fb57a747beaad59dde2135d2e04b3/wutuxuzoluwowexose.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/zisagudazeraxukitapapesig.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/35286323953.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/qj3144s6bc17f5dl835iq1list/50527211459.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff6cb299ef---4647992390.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcbbe2b081---giwibuxarimudigejesiwa.pdfIn PDF document text
    • https://ksboutlet.com/file/files/56479179466.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/954830bb49478504ab55ab1c44e49d53/76478155465.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/wexofu.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/puredajefedi.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/22791593932.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/68rvqrf3dmr7slv3qd3g1g687j/lasidi.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/79a0a1e3940a1277d072d27b1a0335dd/83026317349.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c372d38ce1d---leduxogejela.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/eb95c764cb375bef19f45acb21db8bef/gawaxasi.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5212d1219e8ef7e7d92367ab3afa930f/78517497179.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/maedl0tvthr5254pf4fcnuavu1/vexujiwofokizudofazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=lazy+border+colliePDF 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_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 17060 bytes
SHA-256: cde573772ed3b0979b6e7a73c91c183a315927952929116c72033610a4d66ef3
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 10264 bytes
SHA-256: a933e20e1f0fdcc328bd44b21718f6b4a99158406cc68dc83228c0a01801d406

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