Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ed3e09dd38d689…

MALICIOUS

PDF

79.5 KB Created: 2021-09-09 16:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53d86c0b9a2928cc927a7fc2eff12b2f SHA-1: f1146fe6fdac1339ba3697adf447cb18dd24fea2 SHA-256: a3ed3e09dd38d6895fd1c893f5476dafbd2527bbe70457fbd820dc7b0db75608
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://instant-image.net/UserFiles/Site/File/fixifi.pdf In PDF document text
    • http://silver.jo/ckfinder/blanc/files/70296617626.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/pekudeju.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5408020d1dcaf957586c0ab21db0f211/43076939160.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/38344242665.pdfIn PDF document text
    • http://darstin.com/userfiles/files/21836773898.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/dixusadosagimu.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/gisomazasavag.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/40328887710.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131696bb919d---75902417907.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/wamukes.pdfIn PDF document text
    • http://africareview.in/userfiles/file/jurinidexuxokezudu.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/31963749766.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/9896655646.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/37843199778.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/etokevogevu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/dd887497d1f5043650f2e7ffc3868180/2378608273.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613379d720446---zesuvimefoxaxudubavo.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/tulexapokijivut.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/tedapozol.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/kafapobejituju.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/jagezaketimeresubejanolu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613832b907f08---48881344987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=app+store+for+windowsPDF 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_off0000d544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 10352 bytes
SHA-256: dc30f71aedc0d7d3846fde1e83a812df657321d3c7c43afc12c0a908d32ccd45
font_01_sfnt_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 16860 bytes
SHA-256: 5cd14a458849c3b8f588753a5f7641afe01e87d0aaae02395e73ba384b83e7f0

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