Malicious PDF — malware analysis report

Static analysis result for SHA-256 530a145e4ba805ba…

MALICIOUS

PDF

76.4 KB Created: 2021-10-11 07:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c58f3744035779e69710d0eba38aa14 SHA-1: a82d6537c0683e3ce88cb586a9c813804e5cfbad SHA-256: 530a145e4ba805ba0810fcd1b37b9fc5b390ff443408f22d6bc55cf58257f059
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous embedded URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://studiogallerani.it/userfiles/files/93772498309.pdf
    • https://kccegis.com/upfiles/content/file/20210910015211.pdf
    • http://vit-physio.de/file/11270665548.pdf
    • https://priscar.com/documents/files/fosarubonunaja.pdf
    • https://dangeloremodeling.com/nbloom/fckuploads/file/mofovosolubuta.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153b348aa5de---80730351215.pdf
    • https://sproname.com/files/userfiles/files/sonivopenofinudo.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1616398524ef51---lafonidusom.pdf
    • http://kadh.kr/bobod/upload/file/ziwavovozonukafibol.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d3bdc76bf23e94c58a2582191fa25804/18949261049.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/sd9nnk31fhgbpqqton2k3hb6ul/forarabiropomawo.pdf
    • https://quanghuydulich.vn/img_duhoc/files/12561934586.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352bf56f8a5---duwiwodiwisawazuxivi.pdf
    • http://otworz-biuro-podrozy.pl/userfiles/file/veduf.pdf
    • https://tarsiman.ee/files/file/83660540615.pdf
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210915_163443.pdf
    • https://innotek.vn/uploads/news_file/roraxowa.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b8357d8e1f9c9fdc2715417ed6a104e4/20199176175.pdf
    • http://em-ail.ch/pictures/2/dajedamil.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/77513d727d209b24cab08fb45d0820a8/94673853491.pdf
    • http://studiogallerani.it/userfiles/files/28561937547.pdf
    • http://whipitleather.com/userfiles/file/19436221320.pdf
    • https://friendsofmultisport.com/ckfinder/userfiles/files/7053519680.pdf
    • https://russiancosta.ru/ckfinder/userfiles/files/8182895479.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+does+relativism+mean
    • 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_off0000c843.bin
f7944f9a137bd5612e9709df8404ef3950b2194558a1042fa9c80aab64a4c1ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 10572 bytes
font_01_sfnt_off0000e036.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 16792 bytes
font_02_sfnt_off0000f848.bin
f45a03ded7eac396be59543bf121855293c6ee437592b427735bf12edab4829d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 16924 bytes