Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e72e88308a5c39…

MALICIOUS

PDF

102.4 KB Created: 2021-10-09 05:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0d027d5980e2675c7c864439fa3c3f58 SHA-1: 3d9211e17edef9842c0a219c50ae54fd372eb8f7 SHA-256: 13e72e88308a5c395195b832882c55cc2d91086c06eee90aea7935a569d45bfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://airsoft1.ro/files/file/gefojama.pdf In PDF document text
    • http://intelekt.biz/uploads/pages/files/47039547192.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210905031542.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/18662431289.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/54023241100.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/22768871940.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/82420149787.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/fomoxuderabekikezipewod.pdfIn PDF document text
    • http://yoron.net/up/files/46663243396.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/43969819156.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/lixokojuzinof.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/16088529252.pdfIn PDF document text
    • https://laps.pl/userfiles/file/58721114058.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424dc57312e---34636395602.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/makalulivusizomovuku.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/gidibuv.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/l6o5esigseupchse55oevmtosn/nuvukapomozafefuxexovufi.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/wolatawufasa.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/36302219598.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/569334e464f8347cc6d77e78b577e099/pukofatituranaxazupuda.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/watawijopovipabesad.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-29/20210929093403657853.pdfIn PDF document text
    • https://ocw.tw/uploads/files/vajisazodevojipelen.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/86534880242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=melodrama+play+examplesPDF 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_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 19652 bytes
SHA-256: 2035e6cc652f24db132bf0ee931f1e587e740fde28da37804986d25be9a6adb2
font_01_sfnt_off00015bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBA 10468 bytes
SHA-256: 9dcd37efc2865aed85a9c03d92b5bb9703f66253fab02192f57fbfe0da615045
font_02_sfnt_off00017392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1