Malicious PDF — malware analysis report

Static analysis result for SHA-256 815a60973da23d15…

MALICIOUS

PDF

71.0 KB Created: 2021-09-01 05:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d4124ec0aa7f0ad2a48cbca77947653 SHA-1: 547d9787d16aad2b916fcddaed56c0f6480bf3dc SHA-256: 815a60973da23d15bfd138527f3fd1bc2b64f61c717d1bc24601aaed97c60c77
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF_IMAGE_LURE heuristic indicates it uses a screenshot as a lure, containing clickable links to external domains. These links are hosted on compromised CMS upload directories and form a link farm, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted from this sample, but the overall structure points to a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=relieving+letter+from+company+to+employee PDF link annotation
    • http://akssert.com/userfiles/files/78430205170.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/99368751709.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/df37d5c6f6ef77cc75ce0eece75f2fa2/bitajezodubere.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/3705v4p44vov92p3bukpplfoe1/vumujo.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/25650437034.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/wesatafubodab.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/uctmun3po6q3fut2p6rid7jac7/18567524107.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/17415706055.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa79e4e7889---62063034054.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/5764892330.pdfIn PDF document text
    • https://miet.hu/kepek/31634868011.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210824223501.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/61198856576.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d6f06b5d3---73002898392.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/jafafupovufevurut.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/9pp1ktiu9j9lt70i68rk2683sv/vezuzi.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/0iths8qb0h7qhag402hr1pvtmu/69099137833.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071823c34f63---83121716721.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/30166488306.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e7985440ca71be2157cbe7b8c25aabf2/luwawera.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e181988ce---xajerowixamaweteti.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f0e5c3721---41491139613.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc89e893ce---lililovokamaga.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/nusejipuxemibazixed.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/zafokif.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_off0000b998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB998 14188 bytes
SHA-256: d3cbea670fe95594aef40092fe728ab62162552b47c81154eff17ea7acafbbc1
font_01_sfnt_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 10880 bytes
SHA-256: 9e521851bcdca07758a76b78cab0c6f86cf6c37e966a87477082d05a8c796d1c

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