Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b557dd6dc75a06…

MALICIOUS

PDF

78.4 KB Created: 2021-09-12 06:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c280d386aca5f1e5ed75a0fb6484ed7 SHA-1: 85550203d52fb3f2cc30874ef0a4265e09558c43 SHA-256: a7b557dd6dc75a06b261aebb547d8d5672606e6b79b7c2965abde6797757feab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, characteristic of a link farm used to distribute malicious content or phish for information. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://myreply.mobi/snappshott/editor//file/xaruwezizin.pdf
    • http://alompar.hu/uploads/content_files/files/1239162174.pdf
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/9053539130.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316d83b5d6d---ravuwibuzojonubinotoneti.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb6aca6649---45923092898.pdf
    • http://tractortools.cz/ckfinder/userfiles/files/salidovisuzudipudagimaxu.pdf
    • http://urjabatteries.in/userfiles/file/disivekoled.pdf
    • http://www.deep2001.com/images/library/File/voduwepikekuwevarete.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/532f4230be744a2dc30ad79300c3b2a1/24046789576.pdf
    • http://nextlab-semi.com/files/fckeditor/file/kutasivas.pdf
    • http://mariancozma.com/_user/file/debemuwigarazajuxubila.pdf
    • http://americasbestwingsbeltsville.com/uploads/files/dosiwepesuxen.pdf
    • http://ttccid.com/userfiles/files/76910725711.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b346e46b82---kamudevotozavejeba.pdf
    • https://sts-cct.com/app/webroot/userfiles/files/61948883381.pdf
    • http://aallergy.friend-match.com/upload/files/77695360288.pdf
    • http://dkstores.gr/userfiles/file/21788337851.pdf
    • https://monographie.com/ckfinder/userfiles/files/tubobozoboxofap.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/virap.pdf
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/75643463063.pdf
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/42948574363.pdf
    • https://alajuusa.ee/media/contents/file/jupogobosutumemisagazozot.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zimunewupirisajurorug.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cara+mengubah+icon+di+android
    • 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_off0000d10a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD10A 16792 bytes
font_01_sfnt_off0000e921.bin
e4eb428c126f00deb636c74ce516579bbafd4e184d75a243238e3bfc9f663b85
pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 10776 bytes
font_02_sfnt_off00010175.bin
d1d56cdd6c725614290ba7af7d4417141a2000f917c2e02d9bd23ffc85771c58
pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 16344 bytes