Malicious PDF — malware analysis report

Static analysis result for SHA-256 e275086946fd5a94…

MALICIOUS

PDF

70.3 KB Created: 2021-10-03 05:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58975f0f59ad157cb7a1c411ac4bb4b4 SHA-1: a43239f2b26d1631936d6769c45ce90082a46d51 SHA-256: e275086946fd5a945aff7f3e3572f70192ec28272d20a999073c13d32d09add0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous URLs were extracted, many pointing to compromised WordPress sites and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a spearphishing attachment used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=this+modern+love+will+darbyshire+pdf PDF link annotation
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3cf4eedcb---jiwafigibegu.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/23686943034.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/71812785532.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420eac097dd---vesopupuv.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/26468172155.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/janegekanobukitezenuno.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/putabenobafizilaf.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/20967803420.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/87816413969.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/zibume.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/xokipusekazum.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/godiliraxebepomorub.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/zavetenanog.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/5477835405.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4f73f5e65dfc0f6bd72d77f01390c9a9/lumawifurejitozoribo.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/57891334355.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/89989469217.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/88129186208.pdfIn PDF document text
    • https://arerp.kr/data/file///35526370639.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/8q68glcd2c4kjttn6u8ts74jbg/lusiramifeta.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/fadonigupixi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f402e55cd5---kixatosifozanefepodinud.pdfIn PDF document text
    • http://canvangdientu.com/images/file/ronifiguresa.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EB 15096 bytes
SHA-256: b010d8227e450cd1fcb1faa02509719b38dea2444462683b6d70d9098b82c568
font_01_sfnt_off0000d82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 11036 bytes
SHA-256: 58e252fb278bdff5415029c8b539400fbc72b0855050e88b7e2a89aef265822e

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