Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac13b57303c7f2a…

MALICIOUS

PDF

98.1 KB Created: 2021-07-21 06:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 817b8ae7d307ac07315bff405b4eed2e SHA-1: b3b6657163db6468ef94f370471e29acb5a9ee61 SHA-256: 7ac13b57303c7f2aca02299e712cf1153097473c486fd18cf94384d7283f5373
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://asesorgubernamental.com/images/file/sowedubag.pdf
    • http://accessiblevehicleservices.com/userfiles/file/wikivevorokowe.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ba485377584f5dd12a581d1b1fa71f4/47674110621.pdf
    • http://cuuhoatudong.com/upload/files/51282551417.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b264e7545d0---72008376225.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cddfcac1316---jifalolufigujo.pdf
    • https://sweetburden.com/upload/users/files/6534771906.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b781c51918e---37418013403.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6fce85b545---53314317446.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d3adf912d48ae0833e9c043b02f9fa3e/wazokimux.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/roblf62fgsqbjncuel8luvgc45/kexomolez.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecae1c18a8---36278958238.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e8249c4c5---45713598599.pdf
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/384862989db57939448c4bde452897c2/82207628181.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8c47df5f6---nejapuwaxinidewa.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a2348692---59410187792.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/nowesipufekiwizirukokugeg.pdf
    • http://lycee-elm.org/userfiles/file/budafefosoxefokejilawaw.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0e5999f12---bezigukixubusanosuwig.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d785377b808---23826185735.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/jedinej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=conclave+in+a+sentence
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010701.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 16792 bytes
font_01_sfnt_off00011f0e.bin
a46cc6655870b54f8c6c3582e4f4aa9c5d324f24d7cfd3985861011c8c4a6a3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0E 5120 bytes
font_02_sfnt_off00013173.bin
f7e66b6a4e9433677c5f2912429d1b9f2c98cce1f8c91b1d313df4b365526b64
pdf-font-stream PDF embedded font (sfnt) at offset 0x13173 19516 bytes
font_03_sfnt_off000163e8.bin
6898c51953df96d741313bd1f9d6cfc93446da15303517839019881a43b47084
pdf-font-stream PDF embedded font (sfnt) at offset 0x163E8 10220 bytes