Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e89a733b7e8e16…

MALICIOUS

PDF

100.1 KB Created: 2021-09-16 10:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a700eff3c957afbeeb61cb7cae24e37a SHA-1: e746163fd146d5bad6273b8fff5262bbc1f9a7f8 SHA-256: b0e89a733b7e8e16f7f53db0505581142418494b566dcda724543442a94ef4f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as lures to download further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ee1d25e1---togijifopebibikag.pdf
    • http://zhuoer.ltd/userfiles/file/34459647444.pdf
    • http://watch62.ru/files/files/27754888361.pdf
    • http://1-sanya.com/blog_images/blog_/file/bugabowapiva.pdf
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/9330527524.pdf
    • http://www.gonouvellezelande.com/files/xinazibodofonaz.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c76114065---bitoletixub.pdf
    • http://carzip.biz/files/uploads/files/lugopibe.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a9859d6367f2306a4b870b443b7cd221/sevotobezej.pdf
    • https://egyseg.eu/ckfinder/userfiles/files/zuzugebamaw.pdf
    • http://mywymc.com/userfiles/file/gopumaxuxugigunu.pdf
    • http://tokyoto.pl/UserFiles/file/pagedulizunenedura.pdf
    • http://ailizia.com/userfiles/zekalekeneruk.pdf
    • http://speckletrack.com/update/editor/file/14138300979.pdf
    • http://dunakanyarfesto.hu/ckfinder/userfiles/files/62218074178.pdf
    • http://southerncross-ex.com/images/blog/file/lifut.pdf
    • https://cheesykeju.com/contents/files/11176259736.pdf
    • http://novafish.it/userfiles/files/244583487.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/pefene.pdf
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/75592662835.pdf
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/temolule.pdf
    • https://nakipoglugroup.com/upload/ckfinder/files/57828431143.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dccd778be---xakifalivuwitowupurazu.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pabobebijuvilogupe.pdf
    • https://grdr.org/paidel/ckfinder/userfiles/files/jafozu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=my+hero+academia+heroes+rising+itunes+release
    • 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_off00011549.bin
a62f94dc43f0b3fe28433c2356593279716b8566f109bdb370e82dec1c24ec4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 11024 bytes
font_01_sfnt_off00012e93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E93 16792 bytes
font_02_sfnt_off000146a5.bin
9ec9a80398c5c007b833d78e466e83e9c12e8ef710c2a9858c392918d2a88eac
pdf-font-stream PDF embedded font (sfnt) at offset 0x146A5 22300 bytes