Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ec3a125ad35381…

MALICIOUS

PDF

87.1 KB Created: 2021-07-22 15:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6dda2c1c7ccd095c13bc56d0a238063a SHA-1: f14723124354fc22c0984e44d4a9de9d1d328b6d SHA-256: b4ec3a125ad35381e9205823a8f89aace9b6e9956f710e5861503dc0a91f8c14
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://abcbyspu.com/ckfinder/images_store/files/lebox.pdf In PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/pusspqms7orpjvbt0m5lnp3v33/vujafemozowudamazegivig.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/64435636319.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/tobedusofenodokewivaki.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/sog9i96sh04n83dtbm6lr5t0r0/39643601601.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/foluxaburukarevusak.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2f7023d560ab4f037aa0097d60160dd2/dolizubelufafuxibetodu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e6d0efeae---pibemagu.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/58133686480.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/lotugizujiwajidelava.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/04ec8f7c07d49bbb24e4dc7f62241213/kubokarajumomaza.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/1359373986.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/sukorawasepibeg.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/semis.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ec831b62---naluxikake.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ca4489df5367b9ee6877b72e6ec5ba76/23727692287.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/vu57j39orlek88fjmdh9rudsd5/33979950143.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/16863647745.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce6dedd3f---57663752417.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/77076732775.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1b6cd5fab2136f338178ed5782d10326/15176639846.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891d237b6c0---rukus.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/selutejifulunezuje.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077a956d7949---pisesugimuforisifezijego.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/42456749931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=find+your+power+animalPDF 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_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 10564 bytes
SHA-256: b9c1049d166d050373e2be800537bcfea67376a1cd9054fcc426a6e505660322
font_01_sfnt_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 16668 bytes
SHA-256: 862cac9cf73edbcb0a3a86001b06f2bb1a3b413edb19d596b2ae4d632d8409f8
font_02_sfnt_off00013685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1