Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec92bd23f00c326…

MALICIOUS

PDF

59.5 KB Created: 2021-09-27 13:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2b096b132686f171a993157e31e00727 SHA-1: 23869d1819e07f3b4d0a8b7fb2d86f62005d93c3 SHA-256: bec92bd23f00c326d51cbf7e7737c83a9cc46c16f094162923361ea2367aa3bb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads, suggesting a phishing or redirection scheme. The presence of external URI heuristics further supports the attack pattern of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7129

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://infrive.ru/uplcv?utm_term=car+games+for+android+phone PDF link annotation
    • https://mayphotocopydogia.com/upload/files/wowowikenusoju.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/famoburig.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/dosowukudemobiberij.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45255342053.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/mopurisesuxuxokeruvu.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/wexopejaduzowa.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/59832421006.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/wakubolokurikikosedagekex.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/vixigitusod.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/1375037845.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/nagopusizuxixukad.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75c23245d---7519304240.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/galijulefiri.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/14277515569.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c02d694dd4---diwuramegufebubabukiva.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/7f460992a4ed7fae663d751517174e39/varul.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/lopazabegunaditobomavi.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/tobuzesobod.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/24294734123.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/70167667501.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/votosonixov.pdfIn PDF document text
    • http://apsons.eu/files/file/21067682872.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C5 14808 bytes
SHA-256: 7af2b1e0f8159ca475b1c8c121d920abd0fe0f7225712fd95530ec1a51708662

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