Malicious PDF — malware analysis report

Static analysis result for SHA-256 273d3a29e55824b0…

MALICIOUS

PDF

83.8 KB Created: 2021-07-19 12:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17022c4fd09d9068f9ffd92b81971f16 SHA-1: 85d7825fa7f7e53001a306ae166360696adf93f4 SHA-256: 273d3a29e55824b02075e6d5488888ff32ae60c07ee09cb576852e88f8c05fc4
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and disposable hosting patterns further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://parklanehotel.asia/userfiles/file/97422816946.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8677987d9---tekusodovifotomixubixi.pdfIn PDF document text
    • http://premium-h.info/files/files/57475858838.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/woxibameve.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/faturawodot.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/18266297940.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/zesikefazokok.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lkhe2uutenar6fjo9oum8e2cb3/21754129933.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072677778a0d---luribile.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/998d4571dce801e7abf2be594357bde7/36867860671.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/13404138070.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/f9677801af608b036e7cd3387095a550/xezetujaluxoxitunepuw.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f2bd9a79080a7de4110cd2dd3e3f4992/96212903610.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e76f31bbc---powutepumijerabegitafomeg.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/migaxunanotijelilawo.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f73f59d353---nudikonekofunu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7c3ee067f567daba6f4419e2e58c66e4/50172226434.pdfIn PDF document text
    • https://strechybenesov.cz/content/tiguniwunonibofipezexijo.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/41529530212.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089394c54d8c---71827495721.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/cedfd8abf304f74611f08d88f9368aa0/26785010416.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/cp04va5l7b6rd88o6cnko4lug4/mukiwune.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/92726418062.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b13f5ea27ad8f7c4b39a8fc4dd399ea4/vodepiwonobosafeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=to+my+defensePDF link annotation
    • 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_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 10092 bytes
SHA-256: 8a932cd8c39d0db7df87fefd5943278283578200ae45dd58906d6cbc0ed5204e
font_02_sfnt_off000114a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A2 17472 bytes
SHA-256: 0fd92bb9f611e294cc34636e3d03a4c2f1c3d6d22fe66b6c640d09c4f1e215e3