Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15886f465c26467…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 17:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a3afd133de9381edd022a874cb45dc50 SHA-1: 06c05850f0905c212730b93b42c92ac576e082ce SHA-256: f15886f465c26467566eda4b8f0684520bc8a076099bd3f92a4fd39bbbe27d1e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It functions as a link farm, directing users to various compromised websites hosting other PDF files. The presence of multiple links to compromised CMS upload storage and disposable hosting suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hyeminshop.com/DATA/files/jujibunebijotuwaderuris.pdf In PDF document text
    • https://k85shj16h-561lt.com/contents/files/vipojuzakejibaden.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/2ab4bd9a4dd24e429cdda68f68021163/86317054251.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/57285208353.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161346d5a6efcd---33702440363.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9506f2766179d563df10ea4cb68f1261/61933462696.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/zitoroja.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/96139750189.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/44692516160.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/ninibamotideradit.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/97964948ab89115ee8899afa2d7d8a34/85088672119.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/81157767342.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0ce4602cb4f38f2194435ed07595f429/futupexak.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/digejirazarivefuliwus.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/nibebuberinoxolana.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/47474811488.pdfIn PDF document text
    • http://dsagco.com/Upload/file/gimuza.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/7461710717.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/reginegadipenugizegora.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98622031106.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/12819091007.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461816c2a00---22890382927.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/2559419186.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/47530076625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cv+english+meaningPDF 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_off0000b2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F0 10332 bytes
SHA-256: b41be22ca75372c4b70d853fae0fab44b6182ffb69f51c41d0271df60da25440
font_01_sfnt_off0000ca0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 15124 bytes
SHA-256: df5ab296e850504d5aee2b96503778267cdc56ae692910d014144af6b595ddee

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