Malicious PDF — malware analysis report

Static analysis result for SHA-256 181f708d561dba33…

MALICIOUS

PDF

100.8 KB Created: 2021-09-15 12:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 934aee505d7830e4ef5efe71d9da0812 SHA-1: 91a391226d8327e9cdd9c38330527a8830331b37 SHA-256: 181f708d561dba33b8a22aeb770ad429dbea416f08a34e0aaf5b64870f616f9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://qianlong99.org/ckfinder/userfiles/files/71429391717.pdf In PDF document text
    • https://scout-educationguide.com/userfiles/file/98002398538.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/22919434223.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/8961402896.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc89fcbcd2---japepodu.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210903031139188878.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/nanipamoligidigefisadarer.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/70559069941.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/nogajafazinubufedo.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/kosaxa.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/68237549018.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377138a9df9---86754653331.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/2816720422.pdfIn PDF document text
    • http://centrons.com/uploaded/file/129079915613680c5eb13a.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021913828595155.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef5d3c7602---529741985.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/55965682462.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/190a4cbb70f3f8a7e53919b824bd3e59/26151882482.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26822807980.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2e94416c80495d5f0591dafb00838e9f/zefumopiri.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/zujiwepunava.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/tikitevugedirigedopezulu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403fed781ca---bunufifopon.pdfIn PDF document text
    • http://abwva.com/uploads/files/14800600621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=grand+theft+auto+san+andreas+appPDF 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_off00012530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 10596 bytes
SHA-256: 17caf19e20a2d72bb9a38e3a590ead9aff8420b8c9f552e89f65a71366f1821c
font_01_sfnt_off00013d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D58 18444 bytes
SHA-256: 118c09a6a35845afb42d9dd603b5b1cde57a304ed4b8d4cd9116e44983e764b0
font_02_sfnt_off00016d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1