Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fda402bb6307ae5…

MALICIOUS

PDF

107.4 KB Created: 2021-06-28 16:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7d1b933934ae2133419ed9f14e60fc11 SHA-1: 0d6aed662643a98aa6b1b0caf0fa15966291eda9 SHA-256: 1fda402bb6307ae5404609ee789a6913e9e6e358662c138d8f96e051626d38d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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://medvor.ru/uplcv?utm_term=gta+5+steal+plane+from+military+base PDF link annotation
    • http://franzoesischebulldoggen.eu/userfiles/file/34750809293.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0cd74c993---38471962015.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6edc54936---nebafasureromel.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/62267379489.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160844829cb2cc---62851820258.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/wurikuputimonezu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a766f4e219---78443782899.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727f3a3ab11---36216002996.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/f47e4d351af2449be9db18603b6b778a/dinidux.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/xiketexipotitezosizi.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/figinulofaxoledone.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02fa29743e---tuvumunotesaturelerixeje.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/532ft1etk8r374an5rdeg1dsj2/pubosepudamorenunob.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/81a033ff876f5d3d0bd237501140d072/nuxewolisumuzixofenute.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609903783ed9b---zozifu.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/kapete.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/78327369205.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/827q9e7ar1ncksd0viqhv8vn31/toxetanu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d6430f4bc---25799948161.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f701b32664---kewaserexime.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a249050fa7062dc4381f4ff55ead3555/dotizerudujugezix.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/25995866247.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f51184bcc2---jogurevew.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d3829b33e9c758025726c408b2bcae6d/68104411410.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f215378fee2b07fca117a31fd244620d/718328146.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/jekifemefofumuzutizixuwil.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a7d25a713ffe1728b6786c9c0f6e6f3e/33217842215.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017c23.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17C23 20912 bytes
SHA-256: 744379596d51fc5206ab44bc91a78d8d271aa5f73c181c2e0f38edf03daab048
font_00_sfnt_off000117d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FED 10948 bytes
SHA-256: c1feb735147cf1b436d934e45b39604740413207da1f8f133d73ccd4f42c2f40
font_02_sfnt_off00014929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14929 19036 bytes
SHA-256: ff7a45155fb13a16b9509996b10789214a1814f47b50f422463e60ce386be829