Malicious PDF — malware analysis report

Static analysis result for SHA-256 458bcdc5a882b7ea…

MALICIOUS

PDF

80.9 KB Created: 2021-10-06 17:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 35324b42d55d7fef7857856cf14b4db9 SHA-1: 3866b2a6d1f3ffabd7ae28dafdd0ca2b9db78c7f SHA-256: 458bcdc5a882b7eaf003b3698ba9018867f0ee295dcac2b2288222d4fbbd620e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=hole+in+my+life+sparknotes PDF link annotation
    • http://kientrucsangtrong.com/plus/files/rosufufunewufo.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/gizelar.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/65333397253.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/zefemoruzewubazujomeri.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/jetodowa.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa635c4bdb---80040682622.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/gejisexuxujufepavem.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/64483987994.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/8316673271.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/nekavixogivujimufemeniwa.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/jixewuzivot.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/vagulirojejodozofusomakus.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/96066438404.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4915789d---vinagiridabifasabezib.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/6359097320.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/2410932269.pdfIn PDF document text
    • https://retta-bg.com/userfiles/kubavilinalaxaza.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t41ag9c7n8qmhlmr776u6jf6h0/boganigobinogovekasagesi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/50542245538.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/bowagixajex.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/tofiker.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/69494227047.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/17068168145.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/19310284834.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210922/16322506249436.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_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 10716 bytes
SHA-256: 6238ef578800c61907377a36d0aaeb7de803a31f9fc09724e1969bf683a48100
font_02_sfnt_off000107a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 17928 bytes
SHA-256: 40aed53ac13d01de749c40d2de95cf71c3cd86983e69c60dc942503914a0ff52