Malicious PDF — malware analysis report

Static analysis result for SHA-256 af322c28f64bacc2…

MALICIOUS

PDF

79.0 KB Created: 2021-06-10 21:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 892e49619769dc1b788fa1710fc65d8c SHA-1: a18741977db871f43cbb7bd55d1a9086aee4efc4 SHA-256: af322c28f64bacc23b40be33157392098e8fdd0c31990c0fbdad551ce04dd7d9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to compromised websites, suggesting it is used as a link farm to distribute phishing content or further malware. No scripts were extracted, but the presence of external URIs and compromised CMS upload links indicates a malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=future+tense+exercise+for+class+7
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdb4ee0399---52312961213.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3673e22f98c77b1aae45b1b52d7963ea/22648046636.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/9254efad05920c6ba695102bec55b493/45729604627.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8cbdbd610---linodibuguzozopi.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ain28g3vqjuauqu1d2se9ae9t1/kutuj.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a339396d045---noxutuxugijalogepivozob.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8c1cc1d2ac16301858dee67cceda4a80/simokakukedares.pdf
    • http://alnoorcity.com/userfiles/file/31420183701.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac100049fb3---26513476075.pdf
    • http://accessiblevehicleservices.com/userfiles/file/depuxusapinipapaxoxeje.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/d0b7cf16c4ef05a3ce791d767013e520/rakafifotidupad.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/80ec60fe60597654df08df697fdd92c0/92115668880.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5o0eedma2mkn7spvlm1fknqth7/sokelilukiwopusad.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160892c6735722---mavozuni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f7.bin
e335712cf359fc8123f0b9bb52f7da1c7c9b7efd895d62fa7775f7d4718ca13e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 4980 bytes
font_01_sfnt_off00010906.bin
f5fb9b86265ff9caa36a013732dd06ba804d6cbc167e8d559220843e0f1723a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 10708 bytes

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