Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ed31da0c9915e9…

MALICIOUS

PDF

87.5 KB Created: 2021-09-17 18:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce045db7ad896b185e639eaa0155b829 SHA-1: 43e787ab602de219c45e2dd89bbcf868cbe0bdd8 SHA-256: 09ed31da0c9915e9074daa6e97a2b598ba8ba18a39abffbb71e4ceee12e79bf9
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 hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://orlickachata.cz/files/files/35654517987.pdf In PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/48734596964.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/zuragemutiroxiniwawav.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/mukiwim.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/11932869774.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/75743936652.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/31588835322.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e990fbd418---mudubefevavurinafifekovi.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/narujijebonibivezew.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vajigesokozeb.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/53620740107.pdfIn PDF document text
    • https://kar360.com/resimler/files/69985258440.pdfIn PDF document text
    • http://12shio5.com/contents/files/pividobugejik.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c91d75cfa---60353830133.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/gitarobeviwadinipinowomi.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/rikenaludozere.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/51109718248.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/43fdd250d85a4e487679b51dd6ff94e3/17160493554.pdfIn PDF document text
    • http://offerparts.com/upload/files/8792162808.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/perake.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/xerunotatuwejojawukar.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/guzulegesopedirededimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=spiral+free+movie+streamPDF 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_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 18348 bytes
SHA-256: acea5eea65b05a36164730bcdff7f42ce35d2fffa744dd497edbc3cfb0eef948
font_02_sfnt_off0001389d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389D 10556 bytes
SHA-256: 2c3d54bc569f58ebba3224f47cb4495ee1ba65a24782ae22c2f05363b84e3d44