Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed4fb622a161153…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 02:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5a11ed426e6b165e5656405f8e5b62d SHA-1: 3f3cd9dbfb0b69a92c75b9fd1572a790c3d5ad66 SHA-256: 4ed4fb622a1611531b3a0f7863e543171d3f115cbddd609daceb6f3a59716472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection as Pdf.Phishing.Trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://garglob.ru/uplcv?utm_term=asom+treatment+in+adults PDF link annotation
    • http://gfhs1978reunion.com/clients/56625/File/95546585522.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/41ba736bb0bed766cdcd4bb85856795f/14035980671.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/93460726109.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/2k0p52bn655klphgbrva9r7ffl/81142808714.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/qepo2kc0p1udmj4v8ov6ohngo7/wanam.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd31e938b---xipanavuxevepesubuk.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1c5ff377bddc7dcfcd65a430e2bbce1f/68277642611.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/86716632745.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160e12a1301b10---78606994815.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aae63212402---venerunojipikemopegofe.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/31509395242.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/pavuremudufoxa.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/14d060c11583acbcbb11e59da6442664/dasorazekasage.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/kefumuzadovapotexu.pdfIn PDF document text
    • http://specimport.by/files/files/92185816462.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/34860471080.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/49971774815.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5b91237215d69fda20633a8163cc81ce/tezagenukuzewemixi.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/34914610368.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/gisigoporefunufanuvono.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/5417842587.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/7a2d27aa1f8489690e7ae0d11fa95d87.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/lssdctsp2urcc79khp50ha3328/29739682650.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/45417430829.pdfIn PDF document text
    • 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_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 17288 bytes
SHA-256: 4f7275893a16712659775fb049ef42369d782a7d1eeead94c626b482ff94b760
font_01_sfnt_off00011f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 10488 bytes
SHA-256: 76c397a4319c4a164049b47904bf0f1d019ce043e64806a99824ebd139ca3887
font_02_sfnt_off00013741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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