Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2473b0a8136f99…

MALICIOUS

PDF

81.9 KB Created: 2021-06-25 15:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91c8e6bd6d96b7362f50b8131ad374ee SHA-1: 10b6fe124797482286b3292ceaf495e8b2ef7dbd SHA-256: ea2473b0a8136f99a1295856fb9bd903b382de84e7156dcb4c184fc99f2aba58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host further malicious content or phishing pages. The presence of these links and the nature of the detection suggest an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb02b71fed---gapuvaburozawififanije.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070354376ac6---gizarobuv.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/945405e451bac034ec304ce901355b48/44399645786.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f7e38ef8---viravavatotaremuju.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cc7ab6cbc---liwokirip.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/li64q9qf802u647l129q17kn40/nupiturifunetaforunijafux.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7e25894bf---mebabidojumifukitubado.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/b84aa5f290b4398873dd7e833e8eaf33/68320379272.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/hf0sm2cp0g5lfbaj2nql9m4vrg/pufijotuvomipadoduz.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/1c8e7e35e9d36b4375dff0eefa0e593a/89450721710.pdf
    • http://sport-way.ru/img/file/witaxazejus.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4ae807f7---guzadaragoxilosegefutexi.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/giporulularofedulon.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/967856790.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/legurazavidozamonega.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/381f3702da711f7e5378088eb1b1130e/2784643750.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=family+feud+logo+template
    • 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_off0000df3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 16792 bytes
font_01_sfnt_off0000f74e.bin
64818596676ba6a9caaba82ef002c6aca771b0933478e4a2eb46bbeae93d2404
pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 16584 bytes
font_02_sfnt_off0001227c.bin
6352eed5ce07d57e7730f286c1a4f4bf6d3b21a59588ef15f57571dde6455214
pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 10660 bytes