Malicious PDF — malware analysis report

Static analysis result for SHA-256 022ed43ad317dc45…

MALICIOUS

PDF

71.2 KB Created: 2021-09-14 07:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c01456d3c2b193de0e71ebca4093b024 SHA-1: c819d410ca416ff8f63e6ddc01cd28a032582fd7 SHA-256: 022ed43ad317dc45860df85647b311436b371e97ae2f5c526ebd3727a31df696
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=properties+of+amino+acids+pdf PDF link annotation
    • https://artistprasanna.com/userfiles/file/lojakozefadutewewojedevo.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/46057377730.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/mevugisudoze.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/luninotupolukoxururafu.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/43528017407.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/pejibobonagujonu.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/kutivenadagepumutukodix.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1b7b8553---fofoxifukexe.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/96937813452.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613c674e43d46---xexizowifoj.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/tozivakomuta.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210905005705513.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/75238872183.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5a6e6ef30---6961658568.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/towuvubojewujujo.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/31055748246.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/tuwumemek.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/23650900588.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/kiboxetelavipizak.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/bebikedogoputafakunuvavuj.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/16c804ac57dd040f4580073c974deec7/talunevimixibilani.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/sawedirepalatomipasurup.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/84929545489.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_off0000b996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A8 14808 bytes
SHA-256: ff8d1013fc200005211370ee5eb85cf8e2d2f6070830360cff641bf35c0b2726
font_02_sfnt_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 10736 bytes
SHA-256: 018231bb810eae3719673997e695ca6a111cd9e19ed78fa3478eee5048854215

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