Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d15ce5e782c793…

MALICIOUS

PDF

75.4 KB Created: 2021-07-16 07:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7142467b85d730413613f500603f0574 SHA-1: ef4fbf55e001c6ea621100baf8418145ab4e86d0 SHA-256: d8d15ce5e782c793f49c481901c7fad3632032c38d294f325e716f27f03958e9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as lures for phishing or to download further malicious content. The presence of external URIs and link farms suggests an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://medvor.ru/uplcv?utm_term=graph+the+transformation
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b59e7b315a8---fituripivid.pdf
    • https://kaptenhoki.net/contents//files/dogabujodopabegudof.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8mpksqt1r6kureb8i5160itvt7/87160325563.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/v8kuddbs5du1iifqr3ggkquujk/rurorusovi.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5c05d7e1bd3bec8c9abcfbe67a730fc9/89355268282.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/71a2cf2c9a6ade21da1537214acb3278/guwavezijalo.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/098b455f0eb779a0410192f6a0734f59/55180310788.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608076a78b7fe---17756361544.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/97eu7v21lq159c5ikm5ev6hojb/79309555944.pdf
    • https://guruamardaspublicschool.com/userfiles/files/tebalirakepezi.pdf
    • http://air-ned.com/uploads/files/97435384523.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/c83d80cecd1855cc2b07eeddbe80223e/10566215689.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/38cf7a098878f898e9c6117f20530651/lemoli.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b66d2f0c---88341326375.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/37a7eff4ea1f7e35986fe6830348f76c/45990670554.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/10a6513683d2425edbb7dac3dc7d3883/84307390188.pdf
    • http://mikomisushiwc.com/uploads/files/13598676829.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/961849e2fafa58a3c55ae34c4c08d709/mumaforezezusifotidavi.pdf
    • http://musiclivemarsala.com/userfiles/files/mexerowukidofilubene.pdf
    • http://charivne.info/images/file/guxepugusisizugitetetoj.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/998vu00nicrmd2i0cn0dhtdj4k/231782135.pdf
    • http://tamlaproject.com/userData/board/file/43013516479.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c6ac9dd3365f918adafae7cb168df7fc/xijemuzolusafoxobigogiwo.pdf
    • http://aplus.to/userfiles/file/zirupetigifalodeku.pdf
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/risitox.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608051b4c1916---fobod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3e7.bin
9822289887caf8f295fec3ee0779996e42bf3b5a2273ccf3a4cedec266de0f17
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E7 10616 bytes
font_01_sfnt_off0000dc01.bin
9d1b8431fbfb5ab2fbe2f6f9ef8ce238e0fcf57727d346a236b4ab14c2e9f436
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 16868 bytes
font_02_sfnt_off00010819.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 16792 bytes