Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f9850216a5f742…

MALICIOUS

PDF

106.0 KB Created: 2021-06-25 18:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d066ea3acc26c3fce09d7a724681af47 SHA-1: b38089d378a4930781af3c23ab2c3fda379f4f5e SHA-256: 73f9850216a5f742f0d493c7a6fe944a891b88229a8bcd113df03899933b8ce6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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://kabelkyaobuv.sk/editor_uploads/files/87609100849.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bb86d2c7c4300603f27148a2c36c65bf/18957496903.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/874b5169578e67b0ad95c1afd8ef4087/47315827959.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/f9qb7aaudqt2gqek2i7a7s8jlv/dorozumogimawa.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210518144827_557953997.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2fa62070d---80694352411.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/xugan.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/rojow.pdfIn PDF document text
    • http://belst.by/upload/file/24258699317.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c62bc442f154db92f3ffd3a1d8b15372/zewirugabexutikop.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc78f407518---libalupuwizijaxaxigux.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/26289035381.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/foxolunodibegenagi.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/jasunorogusotoja.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080729df2409---42878181226.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916c7739902---selutubowixarixumaguniwi.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/ede358b55988fffb1c1270b096b7c2ed/15126202986.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c9c86fe29---wasaj.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/elgqvfuhih04hoauu74ubpfsj4/faranekazilerezumo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cae2c9b85df---rodevanojasapabitekiga.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6ed969ac77ab5b1cacbc5e5d11078e6f/94932341633.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/af396379eeb6258d8134db8cde82f2d3/tapusunevoxefuforeji.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/20691419169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=3d+shapes+and+their+namesPDF 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_off00012534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12534 10568 bytes
SHA-256: 12678667ffc04c120f99916a19c87500ffdad716eba0e4deb8109494e8b9c59b
font_01_sfnt_off00013d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1D 17500 bytes
SHA-256: 2e8b92548db3647544cd03d4c6080656047f7494d826c88e97740d67f8f0fede
font_02_sfnt_off00016b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18324 16224 bytes
SHA-256: dc06733fb1b3e8baa4303a7b234726769048d67753183ec25fed266cd0fe6b8d

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