Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e7a2dd4d806809…

MALICIOUS

PDF

108.1 KB Created: 2021-06-27 14:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6798491fad915a0757346477c7ec03f1 SHA-1: 7952ce956162be96566a06b239cf3db7769d4b8a SHA-256: b8e7a2dd4d80680928d0b32e042698ff1f117484402cd7bc9cf7b2cecd766821
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc32c4b034f---62812421242.pdf In PDF document text
    • http://turnyras.lt/Files/file/sufare.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac44e55e631---tivak.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/88edc263ef3a421c891c7d569dc55a19/bogorubigerewumik.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ljphnia6rbiuef2m7oqhaqpbtj/41519394829.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c379665340c7154b2d6c034a1c605003/23367664495.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3e6256e2b6a3ce90f844133e8908f9cf/wigerojowazitodeboruvi.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/96950008296.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2c538d59---41304030496.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9ac0a6a66---47417347735.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c11c52b5d2df74cf7693b1bd854a509c/tefonugo.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfbf4b3a97---piwosokebekefefukobola.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160777f165efae---pobelipofa.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/66213529254.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bddfc9632---xakepud.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/21ab76254ffedc98d3d4dfb0a389a10c/kodomugitati.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zirujor.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fab188f138833c418bf9bd8f5d048f78/27729942138.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kujevaburijulegavozawi.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/27913211356.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/lntvd095v4duq49hom25ltcq7l/viduvagativafuwa.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/7e4bbe5ba77939c6eb5a66c7e512f888/89499932742.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/jidipawi.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/48934880508.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce7e21a04b---65966881856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=meaning+of+courtesanPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001690a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1690A 19140 bytes
SHA-256: a1251039f5cea378b9a61c10db1e5c606ab2457c92b0053f847ea35ab6ab2e2e
font_00_sfnt_off00010e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 10556 bytes
SHA-256: 0fddd7da80ba1a0a31e93aeb9c3f003132efaf1e4d0542ce4586479d6a3716a5
font_01_sfnt_off0001267f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267F 21824 bytes
SHA-256: 6febc8adf867c00a41bfe1b65f2f982c2a36c8b408c46bf04ec6bec1bd42a05b
font_02_sfnt_off00015b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B81 3416 bytes
SHA-256: 45ce902e6677cb15affeb3606dc37f7527b2614dd92a5e7bf0e4ade193c26a18
font_04_sfnt_off00018884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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