Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4c41e2840554c2…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 19:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf1a73ff552e93baa726487755520beb SHA-1: f4ba6ab0c0f816e0aed9e414755fbd650fafb789 SHA-256: 1e4c41e2840554c28fd559ea3eb777fe44aa242611b391f4b4a5944a718e51f0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=strategic+financial+management+formulas+pdf PDF link annotation
    • http://mega-gold.com/userfiles/files/wamemu.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/dozigebufumeravewozami.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/63856507997.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070321c1abbb---wuwusujotodabujotodasiw.pdfIn PDF document text
    • http://drironcat.com/images/file/86346658587.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/58408212416.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/7f34f67e853eb58d5ddccf64cbb0bde9/gijadibediwegogulozu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6a2a0c8eb60d66ebcd0e906277bbad48/pobegiwewepepibafofuxika.pdfIn PDF document text
    • http://safarang.com/basefile/files/gebixejenazesuzusedig.pdfIn PDF document text
    • https://nevisnews.com/userfiles/jefaripenat.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/xiguwategokune.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160daa5e2bb3a5---fewesujuxivezuxiwetawa.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0989a50655b52fb5bebca7084276abf8/volorerideseval.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c446c2b0f0d9890a4d4ec66c985e5332/30711328270.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/14667446783.pdfIn PDF document text
    • http://fairtradeportal.pl/userfiles/file/11789390747.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba64c32291c---6733737367.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/58426089767.pdfIn PDF document text
    • http://mestan.by/images/file/sejuderuratepan.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/desosidiwamukivepo.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/254tf9ecpp18fsa0hnmn4invf1/14456798877.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086712d78ea9---99536811569.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/c7b860e4a073c284f226a7be11248791/letinoxudulujefodux.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/u6qisdqj2ggr902intuc51t0o5/78768108891.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609df37c9d66b---14365028886.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/xuvigaraxix.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_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 17044 bytes
SHA-256: ec58beefb61f83d2634241ff5e379822f2b09d04361de62a23cbc683acbe37d6
font_02_sfnt_off00012271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12271 11136 bytes
SHA-256: dfc8fff80ac67078f318bd0e2ef379c4a070ad6f06b748587643fe4234b98451

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