Malicious PDF — malware analysis report

Static analysis result for SHA-256 394463a45b0e90ff…

MALICIOUS

PDF

73.8 KB Created: 2021-05-07 18:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f703f2ae92ba0d20258d0d102c4c32e0 SHA-1: e20e02462cdf90e6a912133db7c19a70e7e30743 SHA-256: 394463a45b0e90ff88beb2571169c173d9988d37e0d36efa1bdb0850f4974b49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/pppn574b75s5rd18dv9fcri8jn/63682538974.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/809675526231d8b2c994b2445f7c0233/mufukalibegaxobikivinel.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8de6046a3---56093119692.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/593d60baffc8ce8bb95d1e588a46e865/75192169580.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/62f9fd47a12950d7ea8cd791f290af54/48119242166.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/jai6b83sa0fgssu8bvb5872qr7/8015808707.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/o96n1bpj4lkvmgk11pupgc982m/8002046912.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608594cb9fa6e---nefunowoxobigakabefujubif.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084544a8cab9---6241978169.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844eb877706---gapuwulaz.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a89fbad677---18381024160.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079c258a87f1---86599289982.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075160776e49---45109708060.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8b3398050cfdd29ce56309341664e7de/fuwex.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ffe9ae83f461f3e6372c87989086c896/39236888987.pdf
    • http://amadpich.com/userfiles/file/54522411397.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e3324a15c05b462633c1f92d31f65da6/59161291010.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5533ce9c6---49323458973.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=situational+approach+to+leadership+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e967.bin
961dd5e86381679ddd009fc8e6b1b4f6493b89fca6756244e9936e59775089dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 5344 bytes
font_01_sfnt_off0000fb88.bin
ad9a1c3abb18ab8242f05a597839e5feab00d5917e7c40f5afae87d1f93975c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 10584 bytes