Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2090f787fae07c…

MALICIOUS

PDF

82.3 KB Created: 2021-08-16 12:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4e1baec8c4b2a84f1bcd877c58ee5be5 SHA-1: fa0327697100003a84ed29d251eeb94d52961457 SHA-256: bc2090f787fae07c391910212639a77873afd67d8da329c38bea560e54b72225
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics fired, including PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM, pointing to a link farm strategy. The embedded URLs and the PDF structure suggest the document is intended to redirect users to external sites, likely for phishing or malware distribution. No scripts were extracted, but the overall pattern is consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=riverdale+temporada+3+grifos+y+gargolas PDF link annotation
    • http://trips-in.com/ckupload/files/81237987676.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/53944230354.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210623113732.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/zagunitevizifoka.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/sisis.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/rulumij.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jetasezomel.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/vimevene.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/40055310488.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7840dd25---sigemepubar.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edb007ca72d---45132559115.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb77c8753a1---93614560379.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/83777513680.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f95fc426f---84110824829.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/2406027220.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16089a8e79a54b---31888461237.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/6f59dl805c1jug7fapp0seeq1m/wolifazororekalikamomobej.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/tokalesimimeruxan.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f4ce8ba2fad13f7681d8c9ccd7fb35ec/45125868890.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zusililiw.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/tupisagaloz.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/rewusamodusefep.pdfIn PDF document text
    • https://viettrungson.com/media//Files/31714699534.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4cc8d4c64---2936025675.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210724_0592116B49A2D7E6.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 11132 bytes
SHA-256: be358625a588c865eb3fece93a2e168d188253846598af8ccfe1d30ca243ebd3
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 18144 bytes
SHA-256: 4fca8ac447028f5273be0a975368b8f33027ab25f395488ccf9763f9b534127a
font_02_sfnt_off00012328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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