Malicious PDF — malware analysis report

Static analysis result for SHA-256 1629697e1012782a…

MALICIOUS

PDF

88.7 KB Created: 2021-09-20 01:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9ee767fafe80225a7915abc6c46006ee SHA-1: 33584939b4c1a206e376775bdf423e21021fd9ad SHA-256: 1629697e1012782abf93ffcbc15c8b553a4a6d720bee740b9552a20dda2f1476
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to potentially compromised WordPress upload storage and disposable hosting, indicative of a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic specifically identifies the document's intent to trick users into calling a phone number under the guise of a billing, refund, or security issue. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://happinessgown.com/upload/users/files/mamuloginunewagetepavalas.pdf In PDF document text
    • http://kredoteka.ru/uploads/file/kabokelusagijesodinagoxax.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/magediwipowepituwulibik.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/rotogojatukutumerewutib.pdfIn PDF document text
    • http://trieuduong.com/images/Download/59375889955.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3a35a0241c9f9a5895778f8a4d49f3fb/dilajupugimaserige.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/11533155128.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/jadozamavojemo.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210911133629.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/34002705838.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/kiditijafakorutaz.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/rukozujofimisakekebixusaw.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/muxibet.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/mirilobikexorokerav.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/9290958761.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/zenigubapet.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/sipaxi.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/zafikurizo.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/desifixodakutoj.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/gopakafemagepolin.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/378aa300d2917978ed28d724c2f30d9b/57581032825.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/nujewobunuzewofofusuli.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2ddb720249b62fc6546b6085b7e2f48c/65939018003.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/lefipev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=silver+eyes+graphic+novel+freePDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/mojotozopotarelive.pdfIn PDF document text
    • 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_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 10916 bytes
SHA-256: a5c9927fa7c376dfa155b79d39e12e33bba1c10a9fed499d865a17a30b8ed030
font_01_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 18260 bytes
SHA-256: a281c0228bb46bf3d1780d7ba71d75eab817e7de21f97c0290f472f6552f71f2

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