Malicious PDF — malware analysis report

Static analysis result for SHA-256 365a5f1594df5dc3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 10:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 819732769de3975198e09295c4accbe4 SHA-1: 85dd1d5bc2b83db455bcacdd5fe8340f4aba99bc SHA-256: 365a5f1594df5dc31459c36ee32a33ede91782829a93f1ef08eacdbbcfb66803
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting, indicating a phishing or malware distribution attempt. The PDF structure and embedded content suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=es+file+explorer+developer PDF link annotation
    • http://bielwod.com/userfiles/file/22319567274.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/34026971120.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/8944873309.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/3207126304.pdfIn PDF document text
    • http://soles2walk.com/data/file/jijogerapifujik.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136c527ece82---32229421316.pdfIn PDF document text
    • https://eguiders.com/uploads/85156997199.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/betowibot.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b99dc31fe1b736986729a8dacb01618c/10547541540.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/monejeburisotamexukolobo.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0e5a8d4b6866a8d0cfa3066fc39c5d9b/wotutexolirogolugo.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/59739949449.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/lobowananurazafo.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/15473355473.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bk7c1smsd41vofsmq99p99lcb5/ruvugugajum.pdfIn PDF document text
    • http://confetti-seasons.ru/upload/files/97299807323.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/sajewesuv.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/15895193626.pdfIn PDF document text
    • http://apart1day.ru/file/76629194895.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/21184497806.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/potakofena.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/dutosexulatutagudulewamok.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/45226136626.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/limarem.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_off0000e454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 18608 bytes
SHA-256: f568f5ab3a214aa1b87755c15681038652ad16350f0812157353b0e28c53cd90
font_01_sfnt_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 10280 bytes
SHA-256: 7f55c638389862b5f4e672a8418c7a181d37eab703ce001f3b0cbc980995c904
font_02_sfnt_off00012caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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