Malicious PDF — malware analysis report

Static analysis result for SHA-256 da174ffebc89122a…

MALICIOUS

PDF

90.3 KB Created: 2021-07-02 01:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b2c16a43c18578fe00b6197468ad2ec4 SHA-1: 17b84df1731c3bcdbf9dc58387920c19f3fe058f SHA-256: da174ffebc89122a0eac58f6d4a8023bebaf52876ea819e16e7702eadc3e2db7
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of multiple external URIs and link farm heuristics indicates a strong intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ikitellirezistans.com/upload/files/57693044138.pdf In PDF document text
    • http://praguetransfer.com/files/file/80535621499.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/1955fpu6nhlq1lbjdjl5u9hlj4/52232615458.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/8f1e369caf445517914266a624de29ac/37641283963.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7e71ba6fc---tofitilaku.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/88593027111.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1065cf7dadcc8627868455d5a595b44a/nokasolufad.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160805d56c4b29---47478857994.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da313be971b---88036273414.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ea7q5in44ml2dun2tgd3qbeusc/nanirerokabib.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1ar4u35djhp2slu77ap1r22fhi/wipanusifixowugokeju.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1544112ef7---83272159060.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a9245294---73007389851.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/xorazegoxududigafana.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d895a45a---vasuf.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/04a4fc1ad1b3316436a329e2ff6bc257/luxigufabisir.pdfIn PDF document text
    • http://stevis.cz/files/file/12994415627.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/3i8blfo5qt475sve6jgbphv9s4/26275904033.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e2fe66e75---fewewobejukojotikuxodun.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4f77572a3---vomujodubala.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/tetakizusidamepuka.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087494a5cf33---mepolipugapo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf63ca00a27---37443404245.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/kanoxulufewedefavasi.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/22859274762.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609849472edd5---85489647236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=answer+for+why+you+left+your+previous+jobPDF link annotation
    • 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_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 10912 bytes
SHA-256: a23b82a0506d01a6cef9be2730f44c70c2b81ae0f130b46eae24e08522aca06f
font_01_sfnt_off000118be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D0 16580 bytes
SHA-256: 6f44e2553a3aeef872d867ca2d2e3dc6c7affb6f56580d99fd43d80e254526c1