Malicious PDF — malware analysis report

Static analysis result for SHA-256 d830dada9541ab61…

MALICIOUS

PDF

83.9 KB Created: 2021-08-08 09:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d92a7ebc22b51052d1a7303d4ef3e6a0 SHA-1: 631d1ef46681aa1b67f1d2f88b12045971586f15 SHA-256: d830dada9541ab612d1e7271697cc885e8a8c7de8ae402c2cc0df1c07bcacda6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to multiple distinct hosts, some of which are hosted on compromised CMS upload storage. The document body is unreadable, but the presence of numerous URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://betalinktech.com/blmedia/file/77001915129.pdf In PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/4d259d4fe76f848975632f8590964d8e/49440730209.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d40a64cc3---33238166972.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/3f20c78aeeaef9974b2cf5b3cdbf940d/ruvegugalofotukugup.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/gasobawekojuxam.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3835c4dbe0---91537294703.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/jatiri.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/tafaxoda.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161099f129ca07---87019324080.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xebavukezarak.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/e00c5b72168a67b5c77ac5850abf4241/5315332478.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7d292f17---nepiviruruxeris.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210612223840_6vuhgd.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/329f580fb5bf3cc2d13a29ee4f04f9a1/83057968741.pdfIn PDF document text
    • https://blogsma.com/files/danojakusifore.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/molatutexoniwivima.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c959fe27321---68562538357.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/silovafumadajigazixa.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/demagewukapijajarijiko.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/muvujotozumepimoxim.pdfIn PDF document text
    • https://bem-sa.com/img/file/99787232664.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608852277842a---zesetovenuvow.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/44294242299.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffc958d7f---26747455890.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0dad3ef6a3b2f1ba0f8dabe58457e333/81713076216.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/25709046419.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/bokodejogisadob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=estar+estuve+song+lyricsPDF 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_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 16968 bytes
SHA-256: 4e59cdd4add6cb6a43d5b94eb50ad3e4c384872fe49c4ba1ba983c9e26816737
font_01_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001282e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282E 10668 bytes
SHA-256: be58ae70623b3e3dd56909a9c374f5e46bc3d5cabcf56dabe2aa7ec29fd80146

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