Malicious PDF — malware analysis report

Static analysis result for SHA-256 923ce61c7fbc32a0…

MALICIOUS

PDF

83.8 KB Created: 2021-06-10 08:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aeb66279685f1cc4b61f02208990967f SHA-1: e336f5831450b0908c23bf595c69999dc3d02242 SHA-256: 923ce61c7fbc32a066fe1f69668f4f9db6df17c27dbd8806a78ed7b1bb0e2075
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that likely lead to malicious content or further infection vectors. The document body, though heavily obfuscated, contains references to 'tiktok pro apk download link', suggesting a lure to download potentially unwanted or malicious applications.

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://laborke.ru/uplcv?utm_term=tiktok+pro+apk+download+link PDF link annotation
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160769a7aeb84f---28324246386.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/bibijamidilepuza.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/57374449489.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b784d4afbe2---divezi.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/91e4abaefe0cc17a0fcb296f1f6dc26b/79973962372.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/weniz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19b21a6861---kowafaroposejoninipud.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/fba47287b5b389b1973244c1b1a39734/lulululeborufabamune.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d744b5d4---4439020838.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/909b81f1627e56910e15e944f95416fa/66693000324.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/can5q7f5ap7adrdm6uom40hfgg/wafewotipi.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/pr41o3rjtha5mbh8djn8b1l43u/tegeturogezeloxazu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/86f6674616b3235fcdc9d7ba898c0f3c/nekudinalawageg.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb776d81d7---81850884096.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b1308fedd---tosokanitebika.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609625eccad57---50405242307.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/wonemofukomezazase.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e031a1f5287f06d8abf88a0efb4fa120/83055080073.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/hbbofcserpjqu44k8i1ko4sbp3/22454122274.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
    • 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_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 4880 bytes
SHA-256: 8141044005ede4cf1f0ffdf826985fa8648d7d75c2da62f0a2eb2a42b6a3d83e
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 2328 bytes
SHA-256: 3a3e2fdfb34ccd16219240637fe3ad505de1ffac0755433b77bb8b57f3a32b96
font_02_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 11780 bytes
SHA-256: b6cbc95c7da611507c9e20c5c3519961155bb23bdcb6a68460c94410801ec0b3
font_03_sfnt_off00012b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7E 16384 bytes
SHA-256: 226a8e4e528c820945b068501793868e9b71e899c703a7ad804f9a2f424011a5

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