Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc90896dc7acd2c9…

MALICIOUS

PDF

147.0 KB Created: 2021-06-29 00:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d468b0e05f852f7de8779d24b2237bbe SHA-1: c8942fe75b33b20d01695686a2d635ee955b013a SHA-256: dc90896dc7acd2c96b6165ccac5c9ca2e6d77ca3c912d9b6c171228f4da6bd91
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of embedded URLs and the link farm heuristic strongly suggest the file's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://t2sc.me/userfiles/35153805339.pdf In PDF document text
    • http://bioscipublisher.com/files/upfiles/file/fevepitefetatu.pdfIn PDF document text
    • http://3q1p.com/upload/file/210606055024826127e1r00f3o98uc.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607802f9d40f4---gibapimifituf.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210615210421_3a1okx.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6346b149ae137c4dc2635d458cb88f7a/mosawovopeka.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vt0ghhr5odlg4icc85cudk9kf5/44095644032.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/98655642275.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3ac98a2ebd34749c7401e800108cc030/4900059977.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16236627201004193827.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/e4i99k5kvpqjcka0o3fgprgb4h/tatodatugonawomepigonuk.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vup2qh3ruia0htrg7hkqs4gof3/jefasuwetejezipik.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/ximifizujukupewixopusup.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/0c40699072a95a11430511bf8f6b7bf8/58014009408.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/zubakegedasujixu.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/5247568719.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/padenusilegagazojozar.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/33164268070.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/mezesopupedumutafolidolaj.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b038bebac---razigirevokafafa.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/43dtcbepvc31elp22jj4fgioef/gatiroduxineruz.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609472be0fa1c---tenamukaxezire.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/pitubilavu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608502414b97a---samoriwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=characteristics+of+a+good+messagePDF link annotation
    • 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_off0001dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD9D 10804 bytes
SHA-256: 016a3b986e41ac47e489fdf2efaf897527bbb570e00f61798bca5710c58ad55a
font_01_sfnt_off0001f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F65F 17828 bytes
SHA-256: 419bbb51bf9c14747b63dea4ea58cbca5d57239b58cfcddd54392234c1df5b70
font_02_sfnt_off00022452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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