Malicious PDF — malware analysis report

Static analysis result for SHA-256 375a68b6a6eae3bc…

MALICIOUS

PDF

138.9 KB Created: 2021-06-28 16:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce488f73022c65139ad6e9466271ab65 SHA-1: ab1e55da13fb7cd2f5de54e44f1c148de1069d21 SHA-256: 375a68b6a6eae3bc353caeab26d0f5039a2a70a3902402f086db3ab2171745e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, including compromised WordPress sites and other PDF files. This suggests an attempt to lure users to malicious sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://huntic.ru/uplcv?utm_term=dark+story+behind+phineas+and+ferb
    • http://axiomestates.com/userfiles/file/96600497206.pdf
    • https://editionsitaliques.com/userfiles/file/kutimemuzidedezona.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cfd263e2d---80801157599.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/mgjs97hck98ivh3auqejpv1ll3/dosuragekubuzosefufemowij.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cbea1e915---pusejuganamidi.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722280abe63---wefamisinosutekofejoru.pdf
    • http://aaaexpressheating.com/userfiles/file/makanif.pdf
    • http://apsons.eu/files/file/rodewelejum.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075e95d004ac---84661031612.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2a799a2ce---94486220653.pdf
    • https://zahnersatz.pl/userfiles/files/bemobotowipukisozafa.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb55694e0---bumowagob.pdf
    • http://oishisushigd.com/uploads/files/55882223201.pdf
    • https://grandhotelbulgaria.com/userfiles/file/77828012165.pdf
    • https://burlingame.com/wysiwygfiles/file/64556806511.pdf
    • https://motelandratecuci.ro/userfiles/file/ludipemupeletamusibigid.pdf
    • https://adasms.fr/userfiles/file/51765884398.pdf
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/tuwuvap.pdf
    • http://jatyn.cn/upfiles/202106/file/1623758284.pdf
    • http://sosnovgeo.ru/userfiles/file/71406548297.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607618e832233---livogogaruminiru.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f12dcf965---50191773572.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/su4uqeflu7ii3s95i8r8u2mvoc/69712987399.pdf
    • http://michellesmithscott.com/clients/36670/File/72982391498.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769329a1af5---71739757321.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ba5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA5A 16792 bytes
font_01_sfnt_off0001d271.bin
87f836e481da95c5e109137886a6abde19c8e4c8c94216ba3648e4cf98df5ae9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D271 10896 bytes
font_02_sfnt_off0001eb70.bin
7417d5c28b1bb2d996c740275bc817456d6bb23ff787f9288d8a617e19d21e93
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB70 18568 bytes