Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0f265096295435…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 05:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4527a47adf22cafcdbc5756d7507f89e SHA-1: 874c9857cae1b2f78a7943213b11075c7a2975b8 SHA-256: ab0f2650962954359b291c1f58408ce39b09f3f25dd4f8cc4d3e85da40b85bed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used to distribute phishing content or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the non-clustered nature of these links on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=dr+sebi+alkaline+herbal+medicine+pdf PDF link annotation
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0418bed12---37959350309.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1e2036e55c899a13cd0718d3356356fd/wisodeduxojimarokujip.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/20602535082.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/rukafogoselukajinun.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/79155595386.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/lomuzidanaf.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/9360c72fccbc28fa6f89d15547d82931/60533114440.pdfIn PDF document text
    • https://susta.vn/userfiles/file/96863667061.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/wumifunarovug.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/20b6ebcbdc2f05ebae0b260d0e6accb4/pinaneta.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/7277593709.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ca1a0c02f---26073382892.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/43393306130.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4448e6589b---35832425234.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acfd40dfae---fejijesosum.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/bumudobafabowikozulosar.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85824374047.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/xopulok.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/daranataliwe.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/43483853092.pdfIn PDF document text
    • http://annabarons.lv/files/files/lukegodezetodomozagumepe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611aea63a54e2---61868259888.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/dce9d1336d9d239963d0e3ac68830bf7/30336768069.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_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 17392 bytes
SHA-256: f7774bff2ab518aef7b3954eff4989ede0d414400cddc45bf83e7aeee7379c84
font_02_sfnt_off00011996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 10900 bytes
SHA-256: fae82631e126a4d711958ff82ae6ecdba32dc3fcd28e401deff9b1887443e846

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