Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c364a61178cc13…

MALICIOUS

PDF

79.2 KB Created: 2021-08-19 13:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffd2072789f9cc3971cf3fbda72aec8f SHA-1: 67aaabd41d5675a4024bc4fd542602934673a630 SHA-256: 57c364a61178cc13bff37b27353419dc28ddcaedbdca89bd476a2b2cd2d4d9e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or SEO poisoning attack. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78d1a53024---bakojepad.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd8b50316---tujuluzira.pdf
    • https://gyn-koe70.de/obrazky/file/16793607970.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/dbgd4sh53cm4nk2gum0gp7jvcq/25578471994.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/92744136779.pdf
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/vajubefe.pdf
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/56777615539.pdf
    • https://n-v-v.dk/userfiles/file/74263115785.pdf
    • http://dlikefulproductions.com/clients/875850/File/ranuwupuvog.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa183d0c6---fapif.pdf
    • http://refta-bg.com/userfiles/file/gigexepeforadokuwivaku.pdf
    • http://catgarner.com/clients/873270/File/rawarinununezu.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/scs1ogvedgn4o5l6ph1r8igr5d/32911513102.pdf
    • http://chemtron-vostok.ru/media/file/lageba.pdf
    • https://artcer.ru/files/uploads/files/debamabemesiwa.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6c86070664ef5b2ab68bb9f113ba5438/wuwevuxefibun.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e15b1a24850---giros.pdf
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/zararewezuzukixo.pdf
    • http://minuspk.ru/minuspk.ru/userfiles/file/mijel.pdf
    • http://nicolalazzarotto.com/userfiles/files/muranipivet.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/fa9b8c8377fa217733aebe14b5c9d7fd/luvokeguwina.pdf
    • https://yocarbroker.com/upload/ckfinder/files/52277986138.pdf
    • https://siriusdynamics.com/assets/uploads/files/bijawepi.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/019a9317eb7876efe536e8bda0a4d3de/16230583793.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=indian+astrology+free+birth+chart+in+tamil
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f0.bin
874e811e80fe84f17988c6f7068989b30cd28d092c196a60fa11fcf121605bef
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F0 11128 bytes
font_01_sfnt_off0000ea86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 16792 bytes
font_02_sfnt_off00010298.bin
987c17bbecd0e49e1c4e66673e02f1cc879a78549cad92f76dac8acf16346d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 16756 bytes