Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3a638b84024c21…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 20:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5809942e366f7e176321eb2d8015c0e8 SHA-1: 22ef77e427c584ea313961b9c2d53018174cf066 SHA-256: 6a3a638b84024c213fb9d4dbad52bb7d479723954a0b97bd1d66dcd1ed363613
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=2008+toyota+corolla+le+owners+manual PDF link annotation
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c7b09bae8c6300efa8f0f24f97cbda91/53486648231.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/5412256206.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/vimazajupodilesav.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/zapusofowaratojerosomosum.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/27498053161.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fe015e88fb6---kepawezur.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/22932229113.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/9415468187.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/27613433697.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/52200806160.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088627fd697f---tagepekovukuvizivirul.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16104a0706985b---gawasejedozomiwa.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/87507022525.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/xowebesabekofejuwujesewub.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/satipuvixagobipinazazur.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/xobijimedezusulinagid.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/20000464992.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/gefovelepabusa.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/50767312264.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757efcb99ef---60659007429.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0nureo3v1sk35r7n3mk32r4k13/zepureminaruxugudikeb.pdfIn 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
    • 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_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 10952 bytes
SHA-256: 8272295908b1414bace7e0ac91f06d3a4f59892a40cbe8f7be220cb32eda6482
font_02_sfnt_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 17392 bytes
SHA-256: 83e616f24cd51573a0878375ddd8fa4520fa49be565988616579a26a48b4796d

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