Malicious PDF — malware analysis report

Static analysis result for SHA-256 0528043f4ec557ca…

MALICIOUS

PDF

112.5 KB Created: 2021-07-01 20:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f3af8b139ad96f5a35e06ef4650fbadb SHA-1: 3250853d6ac802c21c52fb80d4ab8f75b7a91616 SHA-256: 0528043f4ec557cab84c2b7c33f802c473c7a662fc5757fd4cf805133c137a8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress upload directories. The presence of 'utm_term' parameters in some URLs suggests an attempt at SEO manipulation or tracking. No scripts were extracted, but the overall structure and URL analysis point to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

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://archism.ru/uplcv?utm_term=meaning+of+the+word+pedantic PDF link annotation
    • http://assistance.uz/images/shared/file/81000745621.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/ravup.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/2e189547cd5834404749cfac2d94655b/wawowi.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/54c81becc00cbc960aceccf73cd4bab2/fafesi.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/womiwunepumoxipi.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717de1152fa---62663732699.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/95316873693.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2f2d53a4---54450255175.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e27424ce41e58aefeebc8fc4ae3acc8d/73376973395.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7c2b86169f192524f943756cd4f0c7bb/bojizerudejeda.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087d80520d12---modafutuvawepopomutamoli.pdfIn PDF document text
    • http://modern-pro.ru/files/file/992528036.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c798656b2---27021945562.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160779458d48c5---verezisamefejinuf.pdfIn PDF document text
    • https://nexusmediation.nl/files/goluviburupiwej.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/dc5a48b31b1b384e43304ca9b15b4b00/zusugemuma.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077afadb48c0---68024673253.pdfIn PDF document text
    • https://aneri12.cz/res/file/sexutiju.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160898ddb1d608---wijasakar.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be89224429c---wozojeraji.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a7d7d6d23---nujevapi.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b09cd390e6---famidovakigabow.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00017fcf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17FCF 27328 bytes
SHA-256: 64c7544d97b1addef4a32857c4a755a21ba9c453b052cccd295aaa7653ba5105
font_00_sfnt_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 28408 bytes
SHA-256: 65a11936842a7dbc75f1bdb5735e99a98dacf721c37d8fe46af636b0264177dd
font_01_sfnt_off00013950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001515d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515D 6140 bytes
SHA-256: 193a6bb32ef9a3897b14fa8a778c1340b38786934706961900fb8bdbbba5df71
font_03_sfnt_off00016746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16746 10764 bytes
SHA-256: f0097f1a3c699d4147b3a85efa4db2e2defd7e82bb7772a80c91b17a49cd464f

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