Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92f2faf2c64d506…

MALICIOUS

PDF

87.5 KB Created: 2021-06-12 05:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dd0d3beeec6bad229d6cf98a433dd674 SHA-1: ea9cc0b05637f894e0dd9b6329d87e33eeacd412 SHA-256: a92f2faf2c64d506e910204eec87f9cc6b5c7f70285514e6a7cf9b0f5f962cd3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the presence of many external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://catamma.ru/uplcv?utm_term=lexile+guided+reading+correlation PDF link annotation
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/9aa0fa3a29fe03fdb171dfe9409bac6d/24033993817.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2c6895db7fbed2456714bf860196f143/98375363647.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/17453024960.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a656b43086---vujidilexadajitoserul.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d7742139---milebazoboturupulevugived.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9f9e03669c8e645b358a834f5ac9daa4/tepesosidid.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/033ab332bf730de5f857b2d4f98d1d89/88528941162.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c1ee27230c9ef80e356df48a818b293a/67895943152.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6739063f9---49337950261.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/xefeguzudiwukoselerax.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f94030da---toguju.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b990d2a238b---pevumuvawewekigovegasofol.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile/%5C/2021050412003078.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160726e359a54b---xigavuwixotoni.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608faf3165fc0---vogafafepagovavi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 6832 bytes
SHA-256: 40e0ad21b19df3db216fd06b1281b08faf1616a5a4e0e4362360d049e0fe8d6c
font_01_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 4936 bytes
SHA-256: 876eec594d219b48b5dc274e6c559805bc2be90f9189a71c82ba425cd4634742
font_02_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 11244 bytes
SHA-256: 5cf02ef8a116ffa6c9dab1cf0cf90fccc3a9736dc6818b3e6470fc0e7d3f472b
font_03_sfnt_off00013b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B35 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550

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