Malicious PDF — malware analysis report

Static analysis result for SHA-256 9508182746968c2d…

MALICIOUS

PDF

90.0 KB Created: 2021-07-14 02:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed8d4d02235a584e296dae1c1fa9bb29 SHA-1: 5de8bde9dbb9f00703d5b48a965a107b47b5cacb SHA-256: 9508182746968c2d8f1b61373d483f184337d26fa0a84f6b42e37027d8fb7fbd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are characteristic of spearphishing attachments used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=little+mix+leigh+anne+and+perrie
    • http://www.allatpatikapecs.hu/images/file/16612958416.pdf
    • http://gayaarchi.com/userfiles/file/20210705221257.pdf
    • https://cleaner.pl/userfiles/file/wafogafevizifak.pdf
    • http://mintaialuminum.com/d/files/9992070079.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/60011184415.pdf
    • http://z500.si/files/xejafijukovapikisiwefadid.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a7264a70c---vimosupefezasozunu.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608782e18b35e---82789428869.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb87206d10---zolixebufilawiwif.pdf
    • https://syteq-pro.com/userfiles/file/lifekor.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8bc705d4af61af472c35bfed6cd1370c/rakoradapobezepiduxikuw.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160988afddb598---17194692630.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865ebad7068---68886908946.pdf
    • https://bruceautoservice.com/files/file/dilapadadidatipiguradog.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac8444fa5f---sodajuwedazebofaxufit.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/tmm5cok9q5co75ks3cgdr6ml1c/dirozo.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/480b63a10a0427370537150b307c7254/43881128786.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6c7848e0---46505133763.pdf
    • http://baaningdoi.com/file_media/file_image/file/wadoxejoxofun.pdf
    • http://optykglowacki.pl/obrazki/files/sifamaxom.pdf
    • https://tenekedjieva.com/uploads/file/98178985029.pdf
    • https://yepsell.com/userfiles/files/vosux.pdf
    • http://charivne.info/images/file/fadanorusakonulifidub.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0899e88cd2c83680957d22133d348608/sosogafimedibu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce2.bin
a4bc7767182a29b52563dfcd9987f94cf7bd4977cca6ab998a71c2acc417b380
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 17512 bytes
font_01_sfnt_off00012ae9.bin
7eeb8168f9de6b37b82111175b95efd85f907b917eaf7ef3404b065511b39ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 10612 bytes
font_02_sfnt_off000142ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142AD 16792 bytes