Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc2dc2fa1791160…

MALICIOUS

PDF

87.7 KB Created: 2021-07-13 10:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1baac7738a155f628b092eb6134eb43b SHA-1: 432614ea097a56d5b05f099e33d899d58799dafd SHA-256: bbc2dc2fa1791160d84274820aa3335d33ae743d3386d61cc57c47bcdf978c11
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alkalacarservice.com/public_html/userfiles/file/20866167192.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d939707b---80952485124.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56f32e339c---15705003224.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/vajuvenado.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e8e8b996f3fc8384a6fd4fb676315239/dutovefo.pdf
    • http://nomaquito-travel.com/editor-images/kupani.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f22bae4a---60558446411.pdf
    • http://scuderieverdina.it/scuderia/userfiles/file/55357817363.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6108544e2b---zitevag.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/01635530cc532f7ed29cfb890b4fb19f/wuvepibavukerube.pdf
    • http://przedszkolenisko.pl/userfiles/file/zurug.pdf
    • http://pileshoppen.dk/userfiles/file/72299460848.pdf
    • http://tms-operation.com/upload/files/ruvinumalovefanuwi.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c35bad902d26df94388559c72f7ce9bc/busubebew.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/7420f4e4620548fa59b884dec9aa4158/fiseluloveterafenu.pdf
    • http://wf515345.tw/CKEdit/upload/files/zexig.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3d2fd46c3d1e297a05d91ce8a2b0752f/10310231646.pdf
    • https://angkortaxiservice.com/userfiles/file/zezukedo.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/89c6a42480f3e4f20964d67920a474cc/lurasuzefizuwetusokasukam.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754d7e1e830---69421396721.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/02ea78acf894c110a57a071fb2e337c3/vosinurukuk.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06751282b7fef7853f9c24fb3bdbf7f5/63645280932.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/d6786476296e0e1d03f130d8c2368494/79334488255.pdf
    • http://mmprogetti.it/userfiles/files/3068944554.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160772e0e7af1b---nubusonafe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fred+saves+hermione+from+ron+fanfiction
    • 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_off0000f3bf.bin
1ff77ac09cdb1f1d71125fbd001b43bc2d4a875ccf72a9c918fea4252f881326
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 17320 bytes
font_01_sfnt_off00012090.bin
272b2272bbe9460502d869cd2ac58f0134da9c93777fd1c202b128c4cf949935
pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 10736 bytes
font_02_sfnt_off00013917.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13917 16792 bytes