Malicious PDF — malware analysis report

Static analysis result for SHA-256 b878563b33166606…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 20:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 736a8c51bbea97fba4e2970aab3c0b67 SHA-1: e12736ca97e75d38b6aed0f1c4c4dcade4b1f664 SHA-256: b878563b33166606927d9e39c1680af942b56f7f33d4799a5bb7b63868d62e81
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs, some of which are hosted on compromised CMS upload directories. The presence of a 'euro truck simulator hack download' UTM term suggests a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://kujainspectors.com/candyticket/uploads/page_images/files/radilez.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/94339324799.pdf
    • http://canshu.dlzj.net/upload/files/20210904143407374960.pdf
    • http://ristorantebiscione.com/userfiles/files/6117217848.pdf
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/tunoxonipoz.pdf
    • http://topp.pl/_topp/file/wemenavidedofizi.pdf
    • http://bfcy88.com/uploads/files/22518152034.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g69di46vvq844sq9uj3no6poi5/3906320331.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/79cf08618f420c3f23dca0a7e5439fff/29211532782.pdf
    • https://speak82.com/_UploadFile/Images/file/39558740593.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/pikikalomefesikovuzi.pdf
    • http://turbotechnik24.de/userfiles/file/41095758513.pdf
    • http://tatishev.ru/admin/ckfinder/userfiles/files/gifovanaburitosuv.pdf
    • https://drhuanghair.com/uploads/files/202109220115331997.pdf
    • https://aprenda-atdi.com/uploads/files/wogadujijikefejumapabo.pdf
    • http://leylatoprak.com/userfiles/file/77844241859.pdf
    • http://kenhuffbuilders.com/userfiles/file/79157867925.pdf
    • https://akemi.ro/hirek/file/jivejukuwuwager.pdf
    • https://rpdev.org/ckfinder/userfiles/files/tafebuzagexita.pdf
    • http://livilgirls.com/files/67173238143.pdf
    • http://innovad-ltd.com/userfiles/file/40253363329.pdf
    • http://mama-care.com/UserFiles/file/95861641212.pdf
    • https://ncvpte.in/userfiles/file/28590457934.pdf
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210908155224.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4daddab7d9bba056f2dfc5e078a88511/mixajosim.pdf
    • https://marugame.hk/editor_upload/file/gagitagutevubiwu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=euro+truck+simulator+hack+download
    • 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_off0000b409.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB409 16792 bytes
font_01_sfnt_off0000cc1b.bin
1b3d1024442f9a2d6cb3fdf288a4bcf6168ffd76a1d73c62f60c3ae85cb7bb20
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1B 17380 bytes
font_02_sfnt_off0000f8e8.bin
76a22dccfe5afa724f14090dc9b8b096efa8a18aea35a3b40ba8116a0f8a5e6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 10764 bytes