Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ffe07e52392f81…

MALICIOUS

PDF

86.3 KB Created: 2021-06-26 07:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8501df05b9fe19c69c4a33c1568fbec4 SHA-1: 1c2f3da6fa0ccf1767611a76e3c8a1fbc7d8f7e2 SHA-256: d6ffe07e52392f8195acad4e9abbf84209323cfc765dab3d50ba79dda611cf3d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or redirection scheme. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing trojan designed to lure users to malicious sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608406cd0bc31---80745998655.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30493cb602---44509268441.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/f9ugfsouml92hql7tg519ikv8o/jifupimevuzojavigu.pdf
    • https://altbuket.ru/files/dowixutapiru.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070975795e19---vifizagizabarixutuxi.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/jadonaroni.pdf
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/vamubebavelujurobasis.pdf
    • http://filtrydokoparek.pl/img/all/7300490147.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44b89b912---zegupewad.pdf
    • http://caratow.eu/userfiles/file/visumazitix.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16220649835816.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/oip7la3490g89tg9h882k2u80r/bavopufefiregiv.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adae251b863---rusuvorivarirubix.pdf
    • https://eberli-medical-supply.ch/upload/file/42386773114.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb420833df---11461455581.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qr3a6l73n9q2nojk5nob38iq0t/jopomuzuzej.pdf
    • https://nada70.org/userfiles/file/36159413176.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/n8883r68pge3ik70aonu1bhnma/vobizuwuruganafofo.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cfdb270ce---sazerajasutojeburik.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b38be2fe---26535759637.pdf
    • https://ubranni.com/uploader/files/20951845948.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755ba49b27a---89060877216.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+a+graduate+capstone
    • 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_off0000ed7f.bin
04f278faf5f7ad0befd41218a517cacce6705190bb56dc724e03f7f8891f4671
pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 10840 bytes
font_01_sfnt_off0001064a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 16792 bytes
font_02_sfnt_off00011e5c.bin
5dac99c5c63190e26ef041ac83923535652e9d4c767c4963d79cb0aef5de4359
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 17100 bytes