Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10ed2d59d6e9975…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 18:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 287d58d237cd06486d602596d0ab0503 SHA-1: a87cf3a8b13d8666fb1a1bf34164905f1f88c67b SHA-256: c10ed2d59d6e9975b88144b3affbc83d3c27de07d5fc5eaffa8afe0946594b3b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The document body is unreadable, but the PDF structure and URL analysis strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/6505cfd0f0f940044b8d1c0e63523038/loxeju.pdf
    • http://dent-pro.cz/pic/file/65227115357.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add21be4b7a---54898295592.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161181a6d693dc---pafilagimebezeg.pdf
    • https://eagle-aviation.com/userfiles/files/51930694978.pdf
    • http://seksdagen.nl/userfiles/file/11685217461.pdf
    • http://machinegroup.ru/img/outer/files/riregetikojojosexamoti.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074abf990ac0---lixomunamaledozu.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/7ff1db85df28213c98a843c73590c2e0/badixowanezuzax.pdf
    • http://bantinnhadat.com/users/files/53965125868.pdf
    • http://cuatudongnhatrang.com/uploads/files/bexakonuxuzujuda.pdf
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/72865300308.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/13754c0eafbe651bfbd01cf248df8f28/vurazujatu.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/40fdb9c25c877e5d9db93de081817283/gusovimokuruva.pdf
    • http://zit-tech.com/userfiles/files/lowozitumawitoxike.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210513031342.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/8uqsim2lfsgkdnlmob7oduclsn/nedugelawavimifusesokoxu.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c878bec1a59---11165160700.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9812409e60cb70434bfed4747ed447b9/59958305104.pdf
    • http://ugyvednok.hu/userfiles/file/46498918201.pdf
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/15397c5969410f50d24fd6df0049b4e1.pdf
    • http://taxiluzern.ch/khurasan/userfiles/files/vatuxizub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ironman+triathlon+training+plan+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_off0000dac1.bin
d7e642cc256730a6c251926ab9f4ef301d328be3234eb10418a430759319d693
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 18120 bytes
font_01_sfnt_off000109e1.bin
7863359dac6a2e4ceb50a050705ec030cdc9d3a9a2a4855bbc27d8fe7e78db7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 10596 bytes
font_02_sfnt_off00012192.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 16792 bytes