Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a170d077cf3d55…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 16:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 198883fb7cc11178133cb2a6be58480f SHA-1: f4b7c5c8f9ffdec93dc4845e01bcadcea7236d21 SHA-256: b8a170d077cf3d559c95773eb8ed09c9a3100bd8b124f61d12cc77ba58c0ab5f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pixomot.ru/uplcv?utm_term=limbo+pc+emulator+apk+2019 PDF link annotation
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/nazudemesifim.pdfIn PDF document text
    • http://elpijisystem.com/file/xilalotebula.pdfIn PDF document text
    • http://rurisnet.org/images/file/50001223099.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161352391dd3b8---bimujurelorugubetale.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/muvawulugovun.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/lulaletoteni.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/tezek.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210903081224529.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/wewosujijijipisimojofebo.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/1e38be68e1bef2d4a3e7872e27910f07.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/1677985848.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/mexuw.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/60005375871.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/pofevafuvo.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2845bd2cf2be477589599211ed5ce94a/87309258178.pdfIn PDF document text
    • http://gdgom.com/upload/file/2109050151377549633jw3mim7m2gp.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/18818752855.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/vilowirapaluwogusexuv.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361dc238b46---59003851080.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/wodesar.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/17635625998.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/13370333353.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/48767332052.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/23498658234.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/mafibife.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_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 20440 bytes
SHA-256: 495434361e69f3e34db9e17f05bdb6fe5ae2922b39c11bdc8822b8e282c03680
font_01_sfnt_off00010d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 11016 bytes
SHA-256: e794b2dbf9621cd37205dd65147d82b37206201f1ba7a661d51e410fdd7247cc
font_02_sfnt_off00012711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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