Malicious PDF — malware analysis report

Static analysis result for SHA-256 a240b2357be2421b…

MALICIOUS

PDF

68.1 KB Created: 2021-09-24 15:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0cadb24ed4433646e015ecdb5dff73eb SHA-1: 4df74f1db83b735e8fff3dc34001f039f2ad1ae2 SHA-256: a240b2357be2421b57c1fb4ef99c75ca0eb457d2c885150aee39778423a0dd64
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Heuristics indicate it's a link farm hosted on potentially disposable domains, designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious classification, likely as a trojan downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://doanandieuduong295doson.vn/namthuan/images/news/files/sarejoxiseregako.pdf In PDF document text
    • http://cistenivytahu.cz/upload/file/23361060444.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/31796724308.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/6948680642.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/20285143960.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/92998412343.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/sakati.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/wedofikoxanuridazejapud.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/31090849977.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/julojanitabakop.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/23788433010.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/paguwumimaxul.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/64892514048.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/wonazituvetibutidijubep.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/gozugor.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161312b12053cc---40877544456.pdfIn PDF document text
    • https://slide-bearing.com/d/files/worifesonexifoto.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/galep.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/puduzadilupenafakofize.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dfbb7adf9---85659182335.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614adc1e6b80a---nuwidulojisav.pdfIn PDF document text
    • http://modern-pro.ru/files/file/rozibexalafijeken.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/sisedujerogenenawawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=vidmate+apk+download+for+desktopPDF 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_off0000ae2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2B 10808 bytes
SHA-256: f66391fa58c4e0c80288082d3735e11a7d5540a62af634020788fb872b4e7304
font_01_sfnt_off0000c718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC718 13696 bytes
SHA-256: c74632d6922dfb4d9c19a46e2e704867d5bd64512e4faad53ffa846aeb3d1005
font_02_sfnt_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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