Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f30a951eaff145c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 23:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3800d901f6a3fbdef966efbdeb67d70a SHA-1: 4b252358517fcaa827800ee8a758b5b60b0e1d89 SHA-256: 9f30a951eaff145c0d7301a5533cfd5291f547f22a146b866145e05d61814b1f
96 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm, suggesting its primary purpose is to lead users to malicious content. No scripts were extracted, but the sheer volume of suspicious URLs points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=android+play+audio+file PDF link annotation
    • http://finara-v.com/file_media/file_image/file/26611773297.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/sozefalitosixesug.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/98428364951.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/xurumaj.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f4818739---tovufamaridutulamevamex.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/48833167908.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/1027djk6b0u483drilf7lp9omv/2726163113.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/sulazoviwojeginoxizabonul.pdfIn PDF document text
    • http://oilspecchem.com/files/bijaxutika.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/36921760271.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161313b0a86104---virarejolagexubiwifunoni.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/dibexez.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/99378236174.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3fb6c91a0a8243fedb03f7251ee8d6ee/29371392638.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/37737966300.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/56337519067.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1b07f05a---nivoxafelowilalubupa.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613676992094a---bapezegeb.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/92110095027.pdfIn PDF document text
    • https://miet.hu/kepek/19110041541.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/fisoj.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/favifuzidasokozeba.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/bemudofarulimasuwubo.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/76388790006.pdfIn PDF document text
    • 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_off0000bb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 15952 bytes
SHA-256: 87fd97e19419a063ecd455bb63614d4f4e00c597968a1b10b1688adddfcca18d
font_02_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 10420 bytes
SHA-256: 540ee2b1e158a084da0eee33b8f7494a86ce950171f5745e389ab74d418aca9a