Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c097c4920170540…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 07:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 5cbfe77ef7038bce7020c90a07a6dfac SHA-1: b8e6a304f96346111cf29e0cf1b53294ec80d641 SHA-256: 7c097c49201705408d44f525fdebc81b7dfa66bdc637d493ab12fcce357a14e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=business+credit+application+pdf+template PDF link annotation
    • http://effektfilm.de/files/file/98598185736.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/48247109504.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7163914a---99233082333.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/41322869642.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/17c0a3342bcd809b869a7f197e883c3f/vuxamen.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/povesu.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/32822798672.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5882099a---maxofujoxitu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835787a48ea---fejubuge.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/81885261317.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/42072598644.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/78ec178ba5d787cef2172af507898b1f/1374463316.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ef8031f80d2aafc506affc1c5d233fb7/likezuge.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7cec56e2a---44117579822.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/pizixasuma.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/66711644225.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210723_4B76C2F9C65DBE41.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/jamereluronu.pdfIn PDF document text
    • http://guitarenko.fr/img/files/tibuparojaxatetipajef.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f529f7405d1---89510077805.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/gixanilelukinapenomav.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8d82c7ad2125d09fad63add752a491af/24915938270.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/17062030363.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a9b2e1708---bagevazenepogowogifadupu.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_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 10936 bytes
SHA-256: e4ca7f88f9ddc42b32ea618dc311ce7c55703e2091fdf0512af49f26977d38a9
font_01_sfnt_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 17816 bytes
SHA-256: bebbc106d6fb27f44da237b95ca88c88d1656632d67465d255d022a2cb56e683
font_02_sfnt_off00012d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1