Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2f5aff199f6dbe…

MALICIOUS

PDF

87.6 KB Created: 2021-06-21 16:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1153deb45935938c023ca28dea1be661 SHA-1: 75793f5a3141368a72dedddf1c47f134cbd7478d SHA-256: ab2f5aff199f6dbeb85c6611a3f04fdfb72a8434260f73a985c62a7c2684cdf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The document body, though heavily obfuscated, contains keywords related to PDF downloads, aligning with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/v50o4itqgsrv4oa23ofocmlv7q/55439275316.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607357d652ef7---10308046221.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b1cddc4ab---gawuniw.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/bebuwut.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/xewagatimuxesim.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/57342588715.pdfIn PDF document text
    • http://intergeored.com/upload/File/24455489741.pdfIn PDF document text
    • http://clingac.com/d/files/61405559562.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/e24d2625e9f54c7cdeb0450ac47a8459/47152604731.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a7ba04cfc---72255469364.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/sojiwegitobosorulomo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe076b5ce5---42912170185.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/xawaxalas.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/90208493796.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/643jsu65kdhfbtnir4fpjq1s99/36272425598.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/s88nt2j5c87utbh3fpl0s24mqu/loritojojizu.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/temewepubuwebadu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mahabharatam+in+telugu+pdf+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 5512 bytes
SHA-256: 2a4b8234de750a6659a90fec4050f489471e0ff83058f81f2261135179d5bb15
font_01_sfnt_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 25504 bytes
SHA-256: 15da4f68380b491d1d8c3874de8cfee2223410f24f26a90a0903e990e4d55c5b
font_02_sfnt_off00012725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 11832 bytes
SHA-256: 1190acfdb4ef162a37001fb4c5a8014304819291b842a758f095ded09bec41e1