Malicious PDF — malware analysis report

Static analysis result for SHA-256 15164d7dffd39791…

MALICIOUS

PDF

84.9 KB Created: 2021-05-24 03:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c87d0b69c6b10a34c6952bf5437b80d8 SHA-1: 4ad22857fca9612eee0875ef11227c9b28689058 SHA-256: 15164d7dffd39791e9bcb051618a5d02ceaeeb009047d6a653f8aa3db19f5823
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to host or distribute malware. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=how+to+get+monster+hunt+gear+lords+mobile
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0dccfd92d70b439509ccff888dec6f60/5812014060.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d28c29440---wogogebek.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6f21f292---59314171892.pdf
    • http://hyundailed.com/upload/editor/file/tizisiwoladob.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094519b24014---jupijekeluwereneb.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f1e7bdea8a431fb9826ea94b24fdaabd/75991597968.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/arjmam80a6aentoabf538sm2a5/xawofekewitafidifej.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/50f21ae079f949351faae9275cbba3fc/88700948524.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096910f2eccd---womezeragajileboriwola.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/q2pabi5i8uj1vr7rikc0r8e4gu/21542876979.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/54bf899323653b1517ebd74533034daa/xiremu.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c54ead7f7---4152693150.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/43057277741.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1b7a7152b---jasaku.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607454c7e1968---73263289518.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb9.bin
2f921e7c5ce882038d36f82f6326a01f01e00ac828ebbd5ae2104be93f1a0249
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 5432 bytes
font_01_sfnt_off00010f16.bin
69bbead3fb87226bcc8d6e844fc28e8fd626494380c82a3d0a34531dd6eb3e6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 11948 bytes
font_02_sfnt_off000137ae.bin
8c8446b68e00b81d50a8a6e52a6b6d6cd6ed3c68f12b9f4dd9b85a058f9c69b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x137AE 6048 bytes