Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38b7f70655081de…

MALICIOUS

PDF

88.2 KB Created: 2021-09-20 02:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d047105bde557066fbf9f707f1e92750 SHA-1: 4980e416acfdceb795c6c0da8af16baca0a61cf7 SHA-256: b38b7f70655081de3fa5eb6c3d08aeeb6b564847456ba4e9bcdd8df13ecf4028
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or malware distribution lure. It contains numerous URLs pointing to potentially compromised websites and disposable hosting, characteristic of link farms designed to redirect users to malicious content. The PDF structure and embedded URLs suggest an attempt to exploit users through social engineering, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=dragon+ball+super+battle+of+gods PDF link annotation
    • https://taptigrihnirman.com/singhania/downloads/file/xakoz.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/kiritimof.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144242f840b5---gilifikevipudis.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/90476537569.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/fec8161662cade03217a72da115e3724/77129335326.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/fiveduvirokijubed.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab91580c7---98854112847.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/39048290288.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/19608135436.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/61430163290.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/27052030543.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/zerazemagumewon.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/ligalufegogunasipogezeb.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/92432138437.pdfIn PDF document text
    • http://goldmustang.ru/files/files/sadoporireluxoki.pdfIn PDF document text
    • https://geniodelweb.com/file/5490326801.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/wegoxuridubimirikojanu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qjldop6u291nmn09u9vc88arv7/7523325734.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/getanujolobupiv.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/57037351366.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/jajodoj.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/fetilawajegaleba.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/pavifobalofojevapegaf.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/zixunapole.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/boxilumaratijun.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_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 10820 bytes
SHA-256: 96328290ab9e5842eb6c5f62910cbb6008697b65261148d13f3ff7cf6d504ade
font_02_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 21440 bytes
SHA-256: f26601a8f854333a598a8c1e3b3ec26db2a710b19bab1a3427da1b3f80dd05a7

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