Malicious PDF — malware analysis report

Static analysis result for SHA-256 b432bcfae60155dd…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 19:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e72fe2df55dc219ff18e687b63af9bc9 SHA-1: 4ea994aeb5bab5cc84c6aa4aae50b1cc3353f327 SHA-256: b432bcfae60155dd7a8eb47a56dd4cf6343706695f72a0f5a5371f0b89d2bb31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs, some of which point to compromised CMS upload directories. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to facilitate the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/50277032267.pdf In PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/fk9sklu75dfmee0m1da927hr12/76066418982.pdfIn PDF document text
    • https://consjurist.ru/uploads/files/maxapurare.pdfIn PDF document text
    • https://kultmotor.hu/images/files/23749791144.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/craf1lm8visofgg6cim0m0c4ir/85274041652.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/d5h3ur3cmkaua5u8ai0v65hev7/53330978283.pdfIn PDF document text
    • http://thepducphat.com/upload/files/sogufazokerexanapuzigis.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4c5e34c7e1299aa5b3638b13d1f18ec4/fivupuxum.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/64854679513.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/bodipowiz.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610526f4b6a25---tubuv.pdfIn PDF document text
    • http://fygl.net/uploads/file/110206499942.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/wopikedipajeluvevunuw.pdfIn PDF document text
    • http://markone-tools.com/upload/files/zokato.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/tovigugivixodufexe.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f1815ab7d---juvibiterurosumas.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/15b2aed233ff1c353033d5bf19babde6/95364907691.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a14cb59a38ff93eb14be80635a618433/49994602423.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cd125eff5---63046237809.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c65a635a---52453952826.pdfIn PDF document text
    • http://teplospectr.ru/images/files/68401181635.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef93e80176---19413679192.pdfIn PDF document text
    • https://birotex.rs/images/files/resuzimopodelofipizopif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=loteria+del+abecedario+para+imprimir+pdfPDF link annotation
    • 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_off0000c55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55D 19140 bytes
SHA-256: fdbae2f01519bc5c711f656c15b6d2fdaf34adc60ad090b3b210f69b2c424f61
font_01_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC2 10608 bytes
SHA-256: 82abae5dceb1964c05738b45f78b4828c195a3fe5a785a981ec760eea9a44456

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