Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6c6db342ff874f…

MALICIOUS

PDF

83.8 KB Created: 2021-06-29 01:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45e7f345726e03597b6140340c048450 SHA-1: 18c74dd6b7c7f9446068c5fdd8c60592bff27288 SHA-256: 4a6c6db342ff874f973e4b80dad66c36c579e73719e119b1ac12dd4447574f52
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077d2fe9c738---89459836712.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160793678d9d88---xogazip.pdf
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/99080044731.pdf
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/68155406304.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e96749dd2ab02da437d139996872e684/lirojenesupukotamujov.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/7026d53be1c7c761d558299184b6993a/bomojiwebemapijifidarupup.pdf
    • http://myappartement.de/web/editor/files/mefusuvekasu.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5625f4eccc6f6dec9eb335a23df3c887/xulefuwivapoletitopen.pdf
    • https://marblo.com/app/webroot/img/files/26482942108.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/102978caccc3c79457031585a6e7cc9b/bisadasikutugu.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/7r788ji1171bs3pp11f1od466i/mofomebazebegotutodavum.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091988db62a2---narobatimidupebiwilitib.pdf
    • http://akkoryazilim.com/userfiles/file/katularomofomajad.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d95719b352---94697836216.pdf
    • http://citescolairedeledit.com/include/file/duxorukox.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ef61f053f---90939650806.pdf
    • http://softwarefactory.nl/images/file/20639623216.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/93072738ae007703a0c811f92279550e/wafubexubajer.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/orijo7ijh8p6bt0m7dba3ma89q/nakofewuzininodenoni.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9alb63rkpj0535ofvh1k8dg1j8/borumaresufev.pdf
    • http://kozelskadm.ru/files/uploads/files/vofirojiv.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8039b8942---guxolexosapofibaneg.pdf
    • http://high-keenltd.com/userfiles/file/dibiketalipovodanube.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/92528041034.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+tryptophan+operon+is+a+repressible+operon+that+is
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a0.bin
c8af1e06b1a45c5914e5f228d6fb8e52e98f2a26344ce825a5a45321fe1d70b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 17144 bytes
font_01_sfnt_off000111d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 16792 bytes
font_02_sfnt_off000129ea.bin
7c743f3b467ac59390a7333df003e876b3e38382191329a5bdb6bd7663a64dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129EA 10568 bytes

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