Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e4d916e5b90af5…

MALICIOUS

PDF

87.5 KB Created: 2021-09-07 22:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9192c1dab33d37637cd68ca957dab4f SHA-1: c0f3b67fd221ddb3d998a3882cb2d6eba0aabce7 SHA-256: 51e4d916e5b90af5d52286a45210c052723818a1344dfb93d05a2004d7ae46d4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=lpic-2+performance+based+lab+pdf PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a3dd16463---48459481418.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/pekofojojodewen.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/39616362157.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/tuwejiwusagibotudupozox.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e37de6c847---xurirom.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/2200908911.pdfIn PDF document text
    • http://ailizia.com/userfiles/pudituxibogojugezirov.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b0fe8fc4817875da6fbf6df4a13e965a/volepurakabosuwup.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/87419438593.pdfIn PDF document text
    • http://bliksis.ru/userfiles/file/gozamokumaguxarurizaxijab.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/somawegasatamegugisizes.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/i0580lf7tmdpm5pdavkrs8ni3b/37448880246.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/pewedemipiwipadulaxonis.pdfIn PDF document text
    • https://nevisnews.com/userfiles/zenum.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/sku65llk6n7asjmtt9l3hc07j8/tipipixe.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffea7ab770---61664789249.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608895d6e39fa---ralogorarolu.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/r3pbehq1ri9dmttpt32ibk3qt4/roxemizedugilorisuvowem.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607593cbe294a---17163411301.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6166a3346---84058710434.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/0db217f9e81b5b22bd57e999e1a87b07/ruvilifepukefanevagazis.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/38419968118.pdfIn PDF document text
    • http://ruihuitax.com/files/file/74676691983.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bebe646482---31633541492.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_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 18128 bytes
SHA-256: 6ea61bc54d64cdb195ae78425a2acc4345f2e7b09923772af6b9c2661e2dfeb5
font_01_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 10932 bytes
SHA-256: aec04f5a6d4633ac845078cd7a152c97bf18c732dbeb192a007ed1d61e4e8db2
font_02_sfnt_off00013883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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