Malicious PDF — malware analysis report

Static analysis result for SHA-256 106207adbaf80264…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 12:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d6655277e6c37510c37896a0f938bfd5 SHA-1: e6d70bf24a6d0337945af34c4815bb945800c36c SHA-256: 106207adbaf802642aebc8bd46d462389f8db8b5853bd7146eaa08c64a6a99f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://otpetye.com/images/shared/file/lanakeril.pdf In PDF document text
    • https://aynadakikemalizm.com/resimler/files/jaligonuvabumi.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/lakujuwotesusebibupapil.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/71561422179.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/97054324747.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369acc2b9a3---19984411311.pdfIn PDF document text
    • http://vucert.vn/uploads/files/21524890155.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090615054580554.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/68042388040.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/59810783788.pdfIn PDF document text
    • http://hevolta.com/upload/file/lotepoxomopanenuge.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/fajutafugavepapumerev.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/tovapugojigu.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/bomuxenimepugejo.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/72832635169.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7b9ab102b220e5f08d8c26f31c3c21b4/36463662654.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/todesapuwewekepit.pdfIn PDF document text
    • https://g-mtcc.com/motakamel/Ups/files/legugosapusinijeweves.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/20173035117.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151d0a1f0739---xepajumifagewewoj.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/dajet.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/mavojopudenuduj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=happy+o+wordsPDF link annotation
    • http://elezioni2014.gds.it/userfiles/file/89499069504.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_off0000add1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD1 10104 bytes
SHA-256: ccd19e8c0f42c87e5e7731bacf9b76ff29c9f755f1f18fcf44d9d0e1bee1a51f
font_01_sfnt_off0000c479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 16260 bytes
SHA-256: cdfc792e8d8207f947be00918255e7de55e05e7b4a84d5ca8f5a4af635bbbb45