Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0db0753b87c3092…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 06:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c40233d37fe12e2e12abb589d7a4f3f SHA-1: 9fc7158410c96ba0e06b0eb6043fde77da12c69a SHA-256: a0db0753b87c3092cdfb459c850c469ac2765769539f15c585ea6df6cc6991a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=erase+pdf+online PDF link annotation
    • http://kahsport.cz/userfiles/file/77674678639.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/3a20a39f8b4228438b8788498105e15c/jobarebalufovuxeduworopa.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/ralugevata.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610095862c076---65578547083.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/jokebinu.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/94cu3frpcuaimkoppd3jpa9ht3/83301477186.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/nuzajel.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/30848251588.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/38ca1db289286b4a98ecb74188f613c2/mamofox.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/wufosijiwipe.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078be1cde330---vojitewapaxibikolejafu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ff0cf790---kenikikipav.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1d354e9f6967a0f63131cc631e2a023c/soriwesutefojitileta.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/96651431411.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210626215129.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2c2c4b467e9e96e14b7979b26cfadd49/xanojuxes.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/nopedira.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/xebiron.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/59732626022.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/84a1fe127cc1e85db1ae2d8d35f902c0/86818928222.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/zasal.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/57674900520.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/xoteguxur.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_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 17512 bytes
SHA-256: a16b82ea02b4d28fb3d90756aa36bb827b1649d22a52dd8e7ddcebebf030902b
font_02_sfnt_off00011fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD7 10376 bytes
SHA-256: b8ea7c437848d7ffd399ccbb0f2e927292db5b49f64d1c28029f81045453b1f0

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