Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4462f17ef74dc24…

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 04:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0fbed11808be59856bb6c00895c5023 SHA-1: c5ab614d6fe1ba2aa33982230b43a741d46380be SHA-256: c4462f17ef74dc24ae7f1e53dce917609bbef99c3d18a4fa95cd3b244d0b1a50
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 as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate an attempt to exploit users, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://irlanc.ru/uplcv?utm_term=6+month+old+baby+not+pooping
    • http://omak1968.com/clients/71178/File/51885676592.pdf
    • http://barudan.hk/UploadFile/file/20210602233511700.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/650d73706445556dd320033e5ffa9587/47750627442.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/93qc3uf7ek6fg4h7dg5efbc0ur/19989072412.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5c2928db5efee0a1aaf8afabee99ea21/gobufomituwubim.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/60b2476132fea49dbb31561a39b6aec1/60299687232.pdf
    • https://thepainter.asia/upload/files/37754136566.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf6e5d640d---63159329175.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/349tvjilsg69jmbjajn1rg7uh0/73146840518.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d4de9952---zajuwugex.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/aejst2lccrbmnurq3ck2q2u2a4/raduwetevedusigat.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c897c7bfb69---vivafo.pdf
    • http://bogelaipigeon.com/upload/file/64662156820.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/66284e0fae12ada10ba04afa3b3812e5/31608995344.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/6642227ea6cb7fe26bf3cfb514d005fc/53402019212.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/37447410375.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/90m9u7n91cgvmrakr66aanpftq/44544724825.pdf
    • http://ankamet.com/userfiles/file/nugifuroxeninun.pdf
    • http://alarcon-v.com/editor_upload_image/file/79356993089.pdf
    • http://yds-wcv.jp/free_images/files/ragividux.pdf
    • http://baaningdoi.com/file_media/file_image/file/jojowusebapos.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c2291d82878f94a526755c85ba0bce38/vapomomepes.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/87081647806.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb6d6c5475---25915999337.pdf
    • https://baobihungphu.com/media/ftp/file/63515962762.pdf
    • http://gat-asset.com/CKEdit/upload/files/jawokimulopuwe.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bqd8v641vqe91f82coj3mv6t14/povopapomenazumixigaligop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79d.bin
b0025fcfb1115e4a4ae464812726eaa44dac47d1f8478822442d0b79a5e959c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 16544 bytes
font_01_sfnt_off00012246.bin
c1b3a23eb46bcaf88e8481ab28ede24b0c60d0d25a5eda191c5accbe9756aab3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12246 10764 bytes
font_02_sfnt_off00013a55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A55 16792 bytes