Malicious PDF — malware analysis report

Static analysis result for SHA-256 f003eb6650b99409…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 13:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 603d9fbe5d0eff591ffdecc3e3aa7fd8 SHA-1: 0427597372e3648fe76d93ca86db77d4e5362598 SHA-256: f003eb6650b994090fe6d1b35317d329b7c1915a27fc01f2ba8d702f27247e36
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and other potentially untrusted domains. The embedded URLs and the nature of the link farm suggest an attempt to phish for information or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6cju96970iatb8aslg0nqu3dn3/24780391167.pdf In PDF document text
    • http://location-appartement-venise.com/italie_documents/files/40818453365.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/wijam.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/toguwapun.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/darikexidijomuzuvukone.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/xapudenufexusukos.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/zutenotirizapivame.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132f39bf31c8---tukamelakogovesepawejum.pdfIn PDF document text
    • http://www.andreapondika.cz/file/zamopofibonar.pdfIn PDF document text
    • http://jaqalsports.com/files/file/68482873098.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3ac8fafa---kapusamunuzodokevel.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/78540245430.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/96106710351.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/xiben.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210916_184518.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/28450700704.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/galakezaz.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140424db2859---20665198245.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bfc986cb2---65593019215.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/gevubamupuroxatog.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/80732811037.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/29263945560.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/tosejozi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a07c92530a---zarimuzo.pdfIn PDF document text
    • https://polytex.de/sites/default/files/detelevafijubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=horror+rpg+games+for+androidPDF 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_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 10688 bytes
SHA-256: fdf0b1561617bbc85c12d8df6c6deb732eb1899af07d3f886e90f6d10da28047
font_01_sfnt_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 17376 bytes
SHA-256: ba68e898895fb0ce6a230b2f03dc05c357855835446fc95621d6d5760c18c2c0