Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c5698f460fa708…

MALICIOUS

PDF

86.3 KB Created: 2021-07-05 14:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ed09d942b77806c13592c5e88ee7460e SHA-1: 37efa9d61ce6c37b3f6283009d01a4005d9d4d4a SHA-256: 72c5698f460fa7088e804e86d8ca92810848884da07305a602a1802bbe882d2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the PDF is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=the+steadfast+love+of+the+lord+never+ceases+bible+verse PDF link annotation
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/407665b55dded85fd93c0b701f558c41/63529434973.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/84134648741.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/zasixutaputogufexatubezuk.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/10387232619.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/edmdi1hmjt77ollho6ag6jiukp/50587888672.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/n20cdgrho92q2ff6m29srj6an6/29604711497.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/40738346494.pdfIn PDF document text
    • http://gyobel.it/public/file/23205106781.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/pkdprfsqt61cm5cgddc3j8dp04/fuzuwokor.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/99c457fa23be474c89b05c1253d1b735/pulelajedeloj.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/kelem.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/meqdang85dj7oo2qpffljccu00/35452735030.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/r2r94l4qj1rngg1qmvv90egnac/donuxemebesijad.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/p7olpue66n2fmh451pb5t47b32/zesagujofexupowowakoli.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e5019e3a---96807626727.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b41670a33---55912375064.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ec8d832e4e4fa4e86b093fa239f00b9c/5124773642.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/zirafenubivuborozodinilil.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ce481ed4c66ebb878a22293883352168/91521883408.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/d15b1fca551672b9662db2528eaf33a3/32251171355.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621539401.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/f5otbp5nuactb00bt6dolsgom0/61861464540.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_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 10744 bytes
SHA-256: a0aa9367e8eb9ca68dfd8d2a692f44798ba807a74ee10b402dc0bc7a28e3a84c
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 16868 bytes
SHA-256: 49a3dfc23f84d6d2faed40640a51db1742ddccaf4b7deb48e7b723cc6b52001a
font_02_sfnt_off0001336a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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