Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a1764bee398aec…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 23:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 374b6156ebc8cb3dec0ed3d324696fc2 SHA-1: 6e660fb83e2289d93c99378aad034a5685a8c87d SHA-256: 50a1764bee398aecd815bab130739e880788153bf2004d2620500062c7285b88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it with high confidence. The presence of embedded URLs and the nature of the links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=how+to+split+a+worksheet+into+two+panes+in+excel PDF link annotation
    • https://dermatologie-chamonix.com/userfiles/file/80664918305.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/86493271777.pdfIn PDF document text
    • http://kotolantopeni.cz/file/13042750902.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/26hs6qf78d34u2q7bsdv6re7i0/fizapejazivesav.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/pakajizewarotewema.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/59900628995.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609822cdefcb6---83800346055.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/kasifuwubudanu.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210812_840E67C56B03BE79.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21cdb3b367---7506402709.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/xuwow.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/81465923451.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/252036552f05408ffbf4a5f6ea7ab78e/49836004681.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/zagupagetoguwobivigined.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c74e249aab---29903680699.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/vibomaduvenun.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/tuzumib.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/mupekevoganapugo.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/77419956124.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3dc9212c2---wevinu.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/gh90r66iavner7gsftklssgvma/41103672507.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/pogitupudujuziso.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ec90188f4a9212a226ce7cf7198d10c/mivodogo.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_off0000d450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD450 10744 bytes
SHA-256: d1bb45165421e9a56e6adea5cbd3e768c0effcd50127c336bc54ba82f9e78710
font_01_sfnt_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 16344 bytes
SHA-256: 0995aed1af952a25907a2dd3493d45d057698685d6d1faa575f21aa19da96232
font_02_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1