Malicious PDF — malware analysis report

Static analysis result for SHA-256 099eb38d5a8f177e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 17:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fee03aea9613b9af24563c4296b9cf5e SHA-1: c0019af3fb9497e7b899b981fc0edbff3b084ac9 SHA-256: 099eb38d5a8f177e3411cdf60cffd3c483f019392c40305d9398be2906748119
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=show+battery+level+android PDF link annotation
    • http://gewald.ru/content/Files/vuxejazusexupotipunixu.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/70198347993.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/c9521d95e9c301e373aa897a4434429d.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///gafupavodogop.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/72841983500.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/dimifekosotakilamu.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee195afa24---zikodapek.pdfIn PDF document text
    • http://wjcopy.com/upload/files/74679751226.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490269a3bbf---tufulega.pdfIn PDF document text
    • https://eravikulamnationalpark.org/ckfinder/userfiles/files/miwitedatu.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/ruxibogibow.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/69663156390.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210924012502_1103899576.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/zapamifeguzefojemafa.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e470a5cdb---fabapufukixufetofotef.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zurikapikotabepuwimaxi.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/83711404066.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/jitena.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/bunuvo.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/15229555458.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a3rhftic0b59pgmtcr8fah7gp/75541159305.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/lofijefibakovow.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_off0000b066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB066 10656 bytes
SHA-256: 449ddbc47bd87dd6e8ed54acebe079bbceced13ecf51731ce64bd6bf4229c45a
font_01_sfnt_off0000c8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D4 17256 bytes
SHA-256: 7a292d9af9500eae583ddba99b6a831ec6f918feb28234bb60047c7d989719c6
font_02_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1