Malicious PDF — malware analysis report

Static analysis result for SHA-256 3571b635bddcd523…

MALICIOUS

PDF

69.6 KB Created: 2021-09-17 17:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7faae2fe6c4ab7d218edfa0d2a4e25d9 SHA-1: 26e48d15459e23a1a97a188888e2e01de1e5e944 SHA-256: 3571b635bddcd5239d562eae927dd94d24a6056a231bc6e35b07aaa1ceb5cb63
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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
  • 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://archism.ru/uplcv?utm_term=csc+scanner+apk+download PDF link annotation
    • https://fiberglasssupplydepot.com/userfiles/files/zosizivegupapizajulor.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/29730486727.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/988123aa3e9a36fea5b75a5d79c84ef7/givegatiranoju.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/gesasaza.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/fejefomodava.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/970c52ea60c8ffc45863b7492f49e46e/51556116864.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/98693166057.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/22188884404.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397a736b1db---60976264269.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/xaxijavejujavelojemilexu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161362585bc40f---xukoxizis.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/45803831576.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139b4dc85e2f---nogudixajemavujubo.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/48647866556.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/266898bu7haf0sggqhihelg817/56310421490.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/88127281723.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141127f66779---99661879005.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161336ed1be373---91848492097.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/lelaniwiris.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358a7779ded---51716895075.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/22308252859.pdfIn PDF document text
    • http://all-premium.com/user_file/files/16916940304.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/bilewevigonusalovud.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/55230567237.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_off0000b2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B9 10524 bytes
SHA-256: 35428214008af563be3c18766129dbc9a7660f5f47c3ca7e90c80e3e355c372a
font_01_sfnt_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 15024 bytes
SHA-256: 9caaa34ea04461af993fecd66514ebfed3a3d7a90f3d36ecc40f0604dc819651
font_02_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1