Malicious PDF — malware analysis report

Static analysis result for SHA-256 f556b40c32b4b142…

MALICIOUS

PDF

86.2 KB Created: 2021-06-25 19:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91e5161054d8d6c9e066b24eb798fdda SHA-1: d3d96b546617ad8e31d11a5139695a00aaae0f41 SHA-256: f556b40c32b4b1424ac406f7a80b147873ba47e269f7c0fa406f7fa1ee363cdc
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of multiple external URIs and compromised CMS upload links points to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://securitydm.com/slicice/file/8912058044.pdf
    • http://ilksolar.com/Images/Media/files/66867270198.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f730782eb---xovezapolafumagatutoka.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2ae6ea4123fc59d7b309d0d4fed067c1/16852612691.pdf
    • http://2ds-creations.fr/userfiles/file/negukesuvelosilezak.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/18712658176.pdf
    • http://sity-luxe.ru/userfiles/file/77029245024.pdf
    • http://bjbtrh.com/files/pic/file/tisafutikogobukon.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b27d5f294---62167955035.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9bf289dc8---75814248626.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609697b0bf474---20052505803.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caeb4d3c0a---96009740543.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be8aeb83c5---jomimup.pdf
    • http://stellamaris.cz/userfiles/guvem.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095974a36978---61950537600.pdf
    • https://coastalstudio.com/images/main/file/xifivofulareleratire.pdf
    • https://ecoretras.com/file/68965535676.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/963vqaegvn45u7cd3r1tdfk01j/51229047819.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/suil3caod3roq6q86h2rbcthqs/dusume.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/b6b17c6bf157c3c6a0eaa322b97a9c6f/bupijigovo.pdf
    • http://aggengr.com/uploads/CMS/file/9488423807.pdf
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/772410979.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607184bd1d753---32416441833.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=do+not+worry+about+tomorrow+scripture
    • 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_off0000eb72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 16792 bytes
font_01_sfnt_off00010389.bin
0dd0dfdb1fca664c6a01b1e2af93a10e23537dc6f4b308d852e8aa85e1cbeaba
pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 10932 bytes
font_02_sfnt_off00011cc6.bin
d9b67a95e4e06b758f9db971ea98a89fe2683427b382ab4789ddaa48eab3beb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 17276 bytes