Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d7d96ecec6065b…

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 23:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5c0a897675565f56ee0a85547e5489f1 SHA-1: 853fcb4e97558e1104fe0da4e3b678c9d10a7bb2 SHA-256: a9d7d96ecec6065b09434b5eb2f5a31962ea45d8e8992cfe1d6e7512afa58932
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide clickable links. It contains numerous external URIs pointing to various websites, many of which appear to be compromised CMS uploads, suggesting a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crysiq.ru/uplcv?utm_term=how+to+transfer+device+storage+to+sd+card PDF link annotation
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2827e662b3011d205fba4fbddc5d015d/lunuwatajopije.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/16507845432.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/96270371235.pdfIn PDF document text
    • http://dogable.de/userfiles/file/92343934502.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/fexixarukenede.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/kodukidiz.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/zedazugu.pdfIn PDF document text
    • http://pnalog.ru/images/file/fumeselexagokuwuvarogu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4a402cbc9---42124804213.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/31771390909.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/79523533145.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/83087927809.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/84903293213.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614071f7cc899---55730864014.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/sofagarimesenedigula.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/dowoguworimuzuxegebafej.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/liloxemididedimodaxuli.pdfIn PDF document text
    • https://botroul.be/uploads/vexedinenukofarevorubume.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/68781134199.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/viseba.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/45769003712.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/demoxuniwovu.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/34295480806.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_off0000adfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFD 10748 bytes
SHA-256: fb06773c3e7a3b39c56952645d19d75ac14c8aaaa13c49698eb6298e6dc5d0d3
font_01_sfnt_off0000c6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 14288 bytes
SHA-256: 0f84fcfde2a8c97384c6fb86a95b3d5b6e2228a459c00726298ebffc0bed08b1

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