Malicious PDF — malware analysis report

Static analysis result for SHA-256 8155eef9f1336a2a…

MALICIOUS

PDF

75.2 KB Created: 2021-05-02 23:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d8a5c6c980211df73a2acf76b558483 SHA-1: dd41e77689b9753d2b1a27f82e09ecd46d703ca6 SHA-256: 8155eef9f1336a2a06d4bf0bff6182c645a61e7c3dadb23290bd0f79a7fc33d5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document employs social engineering tactics, instructing the user to execute a command, which is a common method for bypassing macro restrictions and delivering secondary payloads. While no scripts were directly extracted, the presence of multiple links to compromised WordPress sites and disposable hosting suggests an attempt to host and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16070db8c04577---92487520277.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607894439b5b2---61048328596.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607884dde8629---27263499748.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa96c30d1---lanusi.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/t26m9m4rpk7m7fju5uaao2a11s/tibowatakokotonumoxajujar.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f9fb37f76d011852d7d2147698fd7c10/72362542290.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47099402e---rebipumugizelogolajomo.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00fb12cd1---takipudagatajivup.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/uum7erl04t4r7oqe0inlo16h10/dedamurolatubawosa.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6fc57dd94---pizubutanugudav.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/0708949ea1636b568b64c000318df28e/95968369319.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc4019013---sobigemadur.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ec010bec34aaee626ef32a8cde436ed5/zaxij.pdf
    • http://capmar.eu/userfiles/file/99622764256.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e1a0c5be36e9426eb954be75168f4b95/54202389218.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/bdafbd6c5c14a95be308f5055488e8f9/wozezub.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086a48d863c6---81035290929.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae66455926---kebol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+studio+sync+project+with+gradle
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e706.bin
b4a249e01300258e0344c182a78c5c90a5633b0e9774419145cf70b99f56cb3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 5596 bytes
font_01_sfnt_off0000fa23.bin
28f88bcf5b3f4351f0ae0f8baa46902d4003917ca448affd73957a3244c7d3d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 10276 bytes

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