Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4bb264807ab16f…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 06:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: abdca7efb67b52ac6de8d5deba2b5847 SHA-1: f30224aad4af164dac36626b7c7e37b6de3faea6 SHA-256: cb4bb264807ab16fb3b4d309b790f60e80eb867bbea937dd2bcb6f350954c0bf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, suggesting a distribution mechanism for further malicious content. The presence of these links indicates an attempt to redirect users to potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608088f593129---83362611278.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505064741165997.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607617eedd1f9---97847992306.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/41f1b8dc8828ceb368e6c9192cc0d291/fupesunev.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/sqk702ud4o6cdd4ld179db69nc/lawaguvezobonutapum.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bb63bf6ca---kebidemixebe.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160700f98d1df1---gerepibuxagolum.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/vefubikijesekegovebixe.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/1dc2e48aa389eeb22bfd666aec94db0a/38341878404.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad67f8e86da---vudepidovabapugewozefus.pdfPDF link annotation
    • http://www.klimavill.com//data/editorfile/mubadesewavibofa.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c5e2fa0a---sazokazos.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b91a10b59---61784266397.pdfIn PDF document text
    • http://candientushinko.com/images/file/lataru.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/42599197716.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/sitezumago.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/26221be326ef1c5649cc442f5eb56102/11352083923.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/546416f9769e57b7990815d368a6cc0c/75273235864.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c04fe6c667d---43582509496.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081fff49c518---79905836358.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd8d94dc97---noximirutumufomemidisedod.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf51a641d3---bufiwuveziresuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=kali+linux+sniff+network+trafficPDF 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_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 17588 bytes
SHA-256: 6b69e77d2618e5dcf1119b393cb3d1a783f54f1f7f6410f21d4803deeabc743d
font_02_sfnt_off00013171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13171 10700 bytes
SHA-256: f9c7ae24320d82e3ac3e7c903ac630daee5012493756a6040d31b78dc815106e

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