Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a3f1f666773f9b…

MALICIOUS

PDF

92.0 KB Created: 2021-09-14 11:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ffe05a03c8030a0e0ccf7546e0b8e29c SHA-1: 341f21c0c67d01283a705430a464a7f5838069c8 SHA-256: f9a3f1f666773f9b9fbded1516dd020365bf3c35c6b6be52fc65be74df55891e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior align with common techniques for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://allytemp.ru/uplcv?utm_term=train+simulator+world+apk+download PDF link annotation
    • https://rotitelor.com/contents/files/54227245793.pdfIn PDF document text
    • http://palami.by/images/file/pixorimokanete.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/46944477027.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/72112162793.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/zadosewikotilo.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/45146404224.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/ximubufakanudemox.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109130820218533.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134daa092520---vokivudaxifelibuz.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/1794716612.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/8387955175.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/14q6b30s7t8cvrg9094dc058ci/tugoweluzajonoxekekaser.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/17815278615.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/64722136438.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/76018172423.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/54155078046.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/95979e17db7d5fc1209706856bc17f67/29069033528.pdfIn PDF document text
    • https://anakmeong.com/contents/files/91627612962.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/93887230613.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2419cd188---lowogonusisaxefixebekuz.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/mutasiw.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/fomoxodesiva.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613bf6a5a999b.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/josobip.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_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 10660 bytes
SHA-256: adb7709aaa58fa3be557a6e7d2b7663325d228e298f0036a06d21d1e69468516
font_01_sfnt_off000117f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F2 19264 bytes
SHA-256: 91f76d61b8e67d934f8c7a544972dafba946d545a86f0000e5ed892893e46c58
font_02_sfnt_off00014a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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