Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4b5db45ce6b31d…

MALICIOUS

PDF

102.9 KB Created: 2021-07-27 18:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 722444efcfdd8b3acc46d45bca078d7a SHA-1: ccdc0b318638422bb508a81764e313d733485bd7 SHA-256: 5f4b5db45ce6b31da8b2266b71333c262bfcce77636246db492fac8352e1739f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, which is characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristic findings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/9a8830ac90886ec943fe0c811167abb5/darizageverurapoxenabit.pdf In PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/86367afe9a322f44abe36db6c7e8eb4c/65202046432.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/mitusox.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/13386160039.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/lilukefezobipekinij.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f92aa343f---38910916646.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/bepixom.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/4484922611.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/guwomeda.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/62042705685.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fd81245a92f29988ee3f27ec39d5c55d/45479113316.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/92031565394.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/76993751205.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/2e594a27147d9df8e8e841ec21712906/66735939574.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/pmbjpci68onb16i6cv1i6g13g0/kefamomiginaxe.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607961d1a22b3---worimuneboxi.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/gigas.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/4iptq8j3d6mvhak9ugimoaenm5/xenupubogemej.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/cnt41akcor40ek8drbfhr47kbq/laloxalojolabavuluko.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b80da99ae0197ba3ca1916093f946d9c/95908933116.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/lolepavewedisaveperegipin.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df15bbc89b---lakitarosob.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa13550a1c8---68699760110.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e766dfaf28eefbc0abfda92d8325b0f2/jezam.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c695cede3efe5a238e437a832b46b7a5/laxez.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8gnp89supj1eg4gg2bodg9c1nq/51497591689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hallelujah+shrek+version+lyricsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 18432 bytes
SHA-256: f4eb208f8423c9c1efb09e638e8066f9e6a7509a1793bafbf01fbe9a890454eb
font_01_sfnt_off0001473b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F4C 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off000174c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174C3 10724 bytes
SHA-256: 1c1e0074cd46341dfe3b7eff4c298a70e639d1ba435b72a2d87847c3f78f965b