Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e3d55d318282f4…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 04:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba76893b2a3abd15f4c242297b2611b8 SHA-1: 9e35d5365652b90f7267e5ebbcd32224afe6d95f SHA-256: a2e3d55d318282f4864698cb73323928e3e01dd600e6d00f2492898ce21ad6d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external resources, many hosted on compromised websites, suggesting it's part of a phishing campaign. The presence of URLs like 'ketchas.ru/uplcv?utm_term=send+resume+for+job' indicates a lure related to job applications or resume submissions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=send+resume+for+job
    • http://cerritos.songhakbbq.com/uploads/files/78386685141.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e60d52ec---zetomezixegu.pdf
    • http://floramarble.com/uploads/vusafoguwifofovibuzeru.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479e33a3fee---retuvitunimi.pdf
    • http://sensi-leszno.pl/userfiles/file/43287332121.pdf
    • http://curry-box-deluxe.de/userfiles/file/tajadogijuxupexedejenat.pdf
    • http://jlicentral.com/images/authors/file/pelukufoxanajumatedano.pdf
    • http://hodoan.net/userfiles/file/pogetip.pdf
    • http://realtor-madrid.com/uploades/fckeditorfile/16282601962.pdf
    • http://salwex.hu/file/50560475698.pdf
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/guvikedebefidi.pdf
    • http://mdsalon.ru/img/lib/file/bupibabagurokumemoki.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/35839489876.pdf
    • http://angelofthewinds.net/ckfinder/userfiles/files/dejazake.pdf
    • http://sayarbobinaj.com/file/35476165534.pdf
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22455990717.pdf
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/13588737780.pdf
    • http://saringkarnwood.com/UserFiles/file/4699956802.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613faf1f46f12---rejofomumo.pdf
    • http://dep14kirov.ru/userfiles/file/bobuvoresi.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140710ee9b54---68120966482.pdf
    • https://areopag.ru/sites/default/files/uploads/17935303629.pdf
    • http://one9five.com/userfiles/files/romusonunexotidifesolovej.pdf
    • http://conelser.hu/fck_uploads/file/tibofojiguxanilazafonuko.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 16792 bytes
font_01_sfnt_off0000fade.bin
0b90050aa06e6cd3eaa8ab2a49aeba1a2bd3c2530411de3d853378bcd9355c3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 10564 bytes
font_02_sfnt_off000112ea.bin
50578620b02510fefa55eb96c6d7ea57d0854e231635ec0488b258a102f23092
pdf-font-stream PDF embedded font (sfnt) at offset 0x112EA 18508 bytes