Malicious PDF — malware analysis report

Static analysis result for SHA-256 c161ac5cf07d1ec6…

MALICIOUS

PDF

79.3 KB Created: 2021-07-14 06:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a52a6ee84a70e0c99afb2d540185e8f2 SHA-1: 320e39fd19e0a3768e2f36607e6130ef3a31f9b7 SHA-256: c161ac5cf07d1ec6fd9fe990ece73aa1fc18c1037df855f7343bae61e94e28dd
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users into downloading further malicious content or engaging in phishing activities. While no scripts were explicitly extracted, the nature of the link farm and the detection suggests potential exploitation or redirection to malicious JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/84180aa02790fa7f20ceabbe324c7412/31077581241.pdf In PDF document text
    • http://mobilni-kadernictvi.cz/files/file/josikepefujemowawiw.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/zadetopukewodel.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/selotidirupexenobexogi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f965dddff---91771644876.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d050c106a09---58713721646.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/56020276521.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/45323345701.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/u80ork3evheo0mte5dtq09m2gr/80430173046.pdfIn PDF document text
    • http://fittbikese.hu/files/file/74107821462.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bac0630e3---panolurazezus.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/barewobevewibo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/833eedbf078ae8a550e57806a94036ba/gitaw.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/39de48f73c1beae7aed8b53ae401b44a/64966911514.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/3dbe2a4ab5c6b6436fa638ef958c900c/momup.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/vabosejonedanokiliz.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607185a3e20f2---vimukasizowitipifepexi.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/jeralapokagijisaw.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/23221120328.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/duzetonugofipunirezupidix.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/81384396749.pdfIn PDF document text
    • http://ecole.ru/text/images/file/gonagebizude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=icc+statute+commentaryPDF 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_off0000d4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 10420 bytes
SHA-256: a1d073c2da41ddc345747c1290da2b4179b9c7d1c5126f0216a09ccae9568709
font_01_sfnt_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 16948 bytes
SHA-256: 9d7e11b1da62aca829d9a3a7e41e5e5316e614d7d6cf4a67dec3c6a82ee8d5fe
font_02_sfnt_off00011876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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