Malicious PDF — malware analysis report

Static analysis result for SHA-256 488ae29ba3e24be8…

MALICIOUS

PDF

70.1 KB Created: 2021-09-03 15:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8847181e199bc202df6a423ce1d35ed2 SHA-1: 20f1a05f910c09d371ab0a332eb4e97ccf1e7898 SHA-256: 488ae29ba3e24be8bcd49769f7f0c3e86004a32effff0733153930a0c822a148
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS uploads or disposable domains. While no scripts were extracted, the structure and URL distribution strongly suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://suvagcentr.ru/userfiles/files/14331544347.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2059c6ddd511d9f57cabc57a27c07a27/lonaziv.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/40178327752.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161078714abe37---wefitopovapadetafawoje.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/44f6c3084bab24bfcbd8ec64b541b94c/gesafizelazetoxeto.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/zexurixekiretakot.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2b3f22a4---92143420502.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/zobapedutosafilijexe.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/32224608001.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/modetaz.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6bd5d754ae3b285cf3e4f74028144ab1/44820538688.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/mufakoxu.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/kesupuxoxuvukep.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210818_A5CF9F8E6B1D1779.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/66495269294.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f038a21133---84650127072.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f3825bdb117c18d1cad71772768a5a4f/18960882611.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecdcf87ca7---xakutuzekokab.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ujmnbf2e3hlf8hat4ujfs7uhq0/domozewu.pdfIn PDF document text
    • http://prosquash.by/data/rupijaxepujamavokuduwowe.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/xujewukabewinitopig.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/dilije.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c2cadec384746cbd439be797aaf5c74f/bozitod.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/1107042673.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6378b69088---jolixeligij.pdfIn PDF document text
    • http://iphysiology.ru/upload/zuzuwirirafitavizati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=anomalous+properties+of+water+pdfPDF link annotation
    • 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_off0000b5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEB 10828 bytes
SHA-256: d0eb930fe742c27f3e4827f9308c4fadb3d064c6d3bfabdfbe0044d99dc8b3f4
font_02_sfnt_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 14444 bytes
SHA-256: ae381bea166d37c5e2d9d6f9bb2e0e3740aa5619c73f4fe519d9a9d814f309c0

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