Malicious PDF — malware analysis report

Static analysis result for SHA-256 026bb202a5e28026…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 02:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 66456939d86f0169a678fc73f3f0fb90 SHA-1: 87c9e8b3966377d107315c7d7b3de8cb3ac9b34e SHA-256: 026bb202a5e28026b6daa7aa5f18664e75120267eca9fa083a5aee0afaf26f33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to an attempt to obscure the true destination or leverage SEO tactics for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dalilak1.com/userfiles/file/betozapajugogidoxekup.pdf In PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f437b5a6dc---81732529295.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/29e79cd6fb38c40974140b4f08470e19/ratisalokoxutumil.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/tiwesikewe.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/xikivakegutilaxusure.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/10649245496.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/721bc6b888180c273cae28c3f57b9862/nopumenod.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/zavuzasozizejemubaw.pdfIn PDF document text
    • http://acril.ru/ufiles/files/tabiwinidifuzosor.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/xamisedamibizidu.pdfIn PDF document text
    • https://stopserv.ru/files/file/28427420472.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/74750687765.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6b26537f0f927a9a8328b548f165235d/guvajug.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210630070355.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2205ed3eb---39410700648.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/eee43020a6aa5ae05a269a19a9f4386e/vamudomafagekir.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075692567ae8---kuwurinilasazokolupaxi.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/34235555037.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/2685415402.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/nnhvt8j9gvlc455cbg2d3g1uq6/85454761477.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/famesikukaxudogixapit.pdfIn PDF document text
    • http://erpos.sk/data/files/68957526827.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/cd8efe15b4d3a1d8bcea689ed381ce6b/zasematip.pdfIn PDF document text
    • http://fotossc.pl/_files/file/38782544064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=synthetic+smooth+muscle+cellsPDF 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_off0000c2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 16756 bytes
SHA-256: 0aa0ae996335d5656499cc8a34f7410f2e81be1058120832241ed702e3c28aee
font_02_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 10520 bytes
SHA-256: aef6c2fe1cd02fcec38761328f5a37249df9e18754e03473ad4ab0b2d61a5e44

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