Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbf52dda23ae39c…

MALICIOUS

PDF

72.6 KB Created: 2021-08-28 02:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8ab0fa676ba060d9b4687e7f1b9d153 SHA-1: dc2fd1d82db08c69b1836dd18573f84a2d96ddb1 SHA-256: acbf52dda23ae39cd3d2da6a14cd74dd1e1e01630c14af71bf2d177493e0fb4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=grouped+mean+formula PDF link annotation
    • http://bidmitt.com/img/files/file/numuli.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/fulozobuputamalotoput.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/juvemowowarumanid.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9f630af9---pufivaresizixasizad.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/77095854149.pdfIn PDF document text
    • http://humanlitech.com/files/files/32857532560.pdfIn PDF document text
    • https://mahae.hu/files/files/61898323473.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/48985222610.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/84233047773.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b2ea422e---buzagokevumerirumid.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/vlkh7ad7584f1fj18omgq2a8n5/82285972778.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/makobavorijaxur.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828e57214fc---zizuvepikojimidovonexogiv.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/37391497782.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/javogo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073611416126---73182153864.pdfIn PDF document text
    • https://cet.sk/res/file/banulumoxase.pdfIn PDF document text
    • http://polletnv.be/uploads/files/rorekojufudegagapigude.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8152a52a0---wopotakutasu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606f309b093e9---fomavosolunirifubobasareb.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7dr1u72dj11pglmsjsttav41v3/19194714413.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/nidunirutemu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/lenuvidefe.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/11ud0l3gp5fdgdn4bf7e0sdgm9/weperubasovoral.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_off0000bd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 15104 bytes
SHA-256: 8b8928bca16662d265142c22b59cf84d891ec91733f855f9839d4cb593e961d8
font_02_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 10440 bytes
SHA-256: dbe21268283da7cdb25a6fb66601caf251b57c37814f615e03a40a5c7fd09bef

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