Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfc71ba3defd9a3…

MALICIOUS

PDF

82.7 KB Created: 2021-08-23 14:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d2895886235dba72a2f90acfa58e1f8 SHA-1: 746ccb87fe24e6e8ae558c2cfe9219b56c779f58 SHA-256: 7dfc71ba3defd9a31404323733e50f6af83cc996fdcb196b6de2b22f6ec00b59
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to deceive users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/5e98121eace0605bc91eff58d905787b/55470931180.pdf In PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a40d2a8711---61422647158.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/budunamuwuwapudatawer.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/fozulogosudipadatubuguj.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/64906832592.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/s8i7h4dp3cdg7f2716qt0lk008/nomewafugofevibelujuzak.pdfIn PDF document text
    • http://ippon.lv/uploads/File/gomutobalososuvefavabuv.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609411cdee422---76760444557.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f54a7d6d61a---gipanagenulivironuxa.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee4db0561---19257331387.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/toxavukig.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/7563052079.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/pogaxuvifiduw.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17a10ee54---watelukakosidopilobef.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/853057327612185997c3f7.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/powutamifejuxogiv.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/94341295070.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/ximegojuras.pdfIn PDF document text
    • http://robedecreateur.com/img/files/mizilepadisaruzibuzoneko.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/97397778897.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a13e0df5c---vaxivezelemedabutezadow.pdfIn PDF document text
    • http://dlzj.net/upload/files/2021080417053737075.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160777bd6d0279---7790621478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=low+price+high+volume+strategyPDF 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_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 16536 bytes
SHA-256: 89e733ca134244a406703d0511846fcb99f74d7a108f0dc8f38ef3183369358a
font_01_sfnt_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12397 11040 bytes
SHA-256: d53a33815cf6c25e11828778a0780f99752661e4f9af9c16eeb310d8b4867a3a

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