Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fb0cc81db09741…

MALICIOUS

PDF

95.4 KB Created: 2021-08-07 06:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53bd56bc73415e77e9392f056db9ddbd SHA-1: 32b434f2ef9e8d8dfeab9a2b0528d0158470e238 SHA-256: 44fb0cc81db09741ec818ddc4797bc078fc6a252a821fafb2eaadac3c908e811
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wingmanresearch.com/userfiles/files/xiruwoxororejogige.pdf In PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/20221224782.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/fasenasulokil.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/75074695357.pdfIn PDF document text
    • http://ned.ru/uploads/files/84842022151.pdfIn PDF document text
    • https://migger.dk/userimages/file/75701685054.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ec60bbb4---zikelevuvevusow.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2238d12d17---xusamoza.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/jomataju.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161083cb646551---lotetizopejiwejinuvitixu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925e02bd45c---jazofugonajawanawibol.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5ff12299db51127b3292400e8830f663/zasizexorotopasizu.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ab4f616484a9c59d6593f8a1ced3b646/xotoredugidezaketokuv.pdfIn PDF document text
    • http://pattonbrayboy.com/clients/8/84/8444fd18e659e4cf0f5d78ff5dcadce3/File/43802611615.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/89334669910.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/iglulttsr9vtp4l68ljkuodil3/gelewusafof.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/96115989157.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/radotaxetuluzowuv.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/r2f1s886h2brbqac6d17ko57fj/kokakeb.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/zotoborofinavalijo.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/60437676765.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/gerim.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/vilixidapef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+does+a+logistics+operations+manager+doPDF 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_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001296c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296C 16980 bytes
SHA-256: 5fa014d9f0dd8ab4ea5e35408f5f59cc0ab234c5902ab4b435682d78541675fb
font_02_sfnt_off0001559f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1559F 10956 bytes
SHA-256: 5b20ab2d2bc0ca1aa2c929a637554dc5138df77769414b3c009e2ac78cbdbf11