Malicious PDF — malware analysis report

Static analysis result for SHA-256 135cbe79b36ad59c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 04:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34d7c0ec3c0d06a9b40442e67c21b785 SHA-1: 74b5038758ee05f7058f8be943f1416167e8b782 SHA-256: 135cbe79b36ad59c3283d5c7f7065dac83d3f36c50f76bbd676db5f284a8e595
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=nova+legacy+3+mod PDF link annotation
    • http://4chan.ro/UserFiles/file/sejefegosamipurejoluxa.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/99842729314.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/14549608065.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/q0frd8os9d03dqeube835i7lau/48191141727.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/kuvoxizifo.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/16296406929.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/tizuzodisiza.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/79247742383.pdfIn PDF document text
    • http://telecycling.org/files/file/wegozakorazuwip.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/83652355830.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/35376167562.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614256b44d62c---45731224990.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/89387726014.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/64288627306.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/996102927.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/susalusepigudewugasuna.pdfIn PDF document text
    • http://ahchala.com/img/file/lefolabirijiwab.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b25d2f473---79039522042.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/100a582b6442e4fb227957bb5336a9d6/wugumomekosex.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59cfa4492---guwowutobotufuluxulu.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/48108961275.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/81379513479.pdfIn PDF document text
    • http://st03.it/userfiles/files/33367248002.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/47894017501.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/93449998121.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5ED 10480 bytes
SHA-256: aaf3cabc30e6d90bf993794d3ed0d5c07f7ddb4834fbd496a439f174a4a9419e
font_01_sfnt_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 19668 bytes
SHA-256: 327c0682cd0ed784950b42d4004b2009727aa877df8766e9ba5ec4f2c1fa09e7

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