Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffd682e820894e6…

MALICIOUS

PDF

92.2 KB Created: 2021-07-03 15:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10fc1c06ec494bcf1f5966af72e0004c SHA-1: 80fef18167ae96e111802b2c631a58f151d3166f SHA-256: dffd682e820894e67191f6d4322f8fc222f019a6b85737b1670f542ac1ed73fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and links to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://inwebjor.ru/uplcv?utm_term=petechiae+is+it+itchy
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/69e66939450b0392269dc20d6bdfd65c/bijosugexezogiset.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6d5a1809b---zizukewolise.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c3d4d9f28d24d26c46c95c0e05e80d90/tezivabuz.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/qkoeddkv4us6imp5kie8etgg1r/piwin.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608845c374c38---35153712373.pdf
    • http://omni-links.com/images/blog//file/80912811235.pdf
    • https://sardavetri.it/userfiles/file/saxerov.pdf
    • http://riph.pl/userfiles/file/vitujibaxebiwawezim.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c376b395a48---febowolezenebugilefotixu.pdf
    • https://shiokerbau1.com/contents//files/bidirojovuzut.pdf
    • http://kusadasidentalclinic.com/img/userfiles/files/416300885.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7112ebd0c---wegatilonikifeja.pdf
    • http://cohensevents.com/clients/74638/File/rolul.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7c2b86169f192524f943756cd4f0c7bb/bojizerudejeda.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/hthtcpr91q5jfiqjvo60d2oi1e/kipusuxupajena.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cfd85550d---kufetuzutusutaxuguvesugif.pdf
    • http://bocghebinhduong.com/media/ftp/file/97281060079.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f166a5a6d---57758894624.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608624133ddf7---dakezolar.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c181bba447f---18509136806.pdf
    • http://thedewakohchang.com/image/upload/File/1347282069.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b98e05677f3---pusagerape.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607577d9b96e2---nuluruv.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/bvuv31i0kfhdct0q9ueuhv770m/48927960345.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a31882515b5---katazapotilemef.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a54n9u10kjeti5vu363lviude6/26613978478.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096d75c14c58---dufozibetakubowikubu.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_off00010698.bin
5a9215e843fcfa1956176d49a7a55be6f85f0e7a671a5d6a6141adde7e70848f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 17656 bytes
font_01_sfnt_off000134c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134C0 16792 bytes
font_02_sfnt_off00014cd7.bin
0f7db4675de76fb55152220ac7869b192ee8e2a297c5179cdd499d9c24d5d0a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD7 10072 bytes

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