Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22072454923c6fa…

MALICIOUS

PDF

88.4 KB Created: 2021-07-01 20:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69ed91386d18fa3fcf8e7063c0006619 SHA-1: f568958da71cbf861a107468b96517c7cfd2acdf SHA-256: e22072454923c6fa566989e1ccaa3616afeb22aa103197a21b79a679f233fee3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4459278bf---56811410448.pdf
    • http://murito.fr/ckfinder/userfiles/files/6937567157.pdf
    • http://cuatudongsaigon.net/uploads/files/94111349338.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160726cd0183d3---rigopigibewe.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/35174932381f27b96d1981f09512f269/lopaluzadisokobilugago.pdf
    • https://ghnservizi.com/file/87754660666.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/03ae3e3823eaa8897878ff9b0ac0dd31/76773184471.pdf
    • http://khautrangkhangviet.com/upload/img/files/zomagegubuzilizixa.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/52713ff3a48a17302151cd8a6422d537/87916919947.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d67511fd1---valurasodimunetuxopu.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc66d1086---benusugibilufajujo.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a64aa9d764fbe029d97f01fa300610b3/76030583408.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3cdcac70f2402b08b4ab9404cbb3e0ef/bakamaxaje.pdf
    • http://xpressup.com/userfiles/file/972161398.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a11916d1611---pakivonatejovokazebiroleg.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4967dd03c---95877246157.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0b3d5fa49---38310018867.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7afdc1d372993356e7633b55e13ccc16/57200159060.pdf
    • http://marasintl.com/public/ckfinderuploads/files/56381501149.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa0b9f1a82---33347193428.pdf
    • http://esistore.be/userfiles/file/73938087415.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18b5458ad4---17937114328.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/soxit.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/41b430d8ab7035c0196d252f57868085/92636918310.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd073c9311---tuvidexetuwuwulegidedi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pipeline+design+and+construction+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50f.bin
af4742ef4593d6d425ee4e271a9ac4a83af2996afaed583fdeae8a97432b6f91
pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 10896 bytes
font_01_sfnt_off00010e2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2D 16792 bytes
font_02_sfnt_off0001263f.bin
bbdac12e793457a03775ea5e75e03cef431765cdd7d3da554cb712eb3dd48300
pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 17636 bytes