Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b54d40dc8463f58…

MALICIOUS

PDF

69.0 KB Created: 2021-09-07 06:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 737f35fde30f701216aea95f9bd3d057 SHA-1: bac12439bc9955dff1ab335d811871aac9e3fdd9 SHA-256: 2b54d40dc8463f580e6052a12ee8e3e6e111e8b24158a69290c32993dea68e87
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits characteristics of a phishing lure, including an image-only design and multiple embedded links pointing to potentially compromised websites. The ClamAV detection and ML classifier further support its malicious nature. The document's structure and numerous links suggest an attempt to direct users to external, malicious content, likely for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • 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 69 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ren4boa1arffdf3s0jm2usvgs2/93402032041.pdf In PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/20931190652.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/e30fe8f14448cc41add5eace61c2eac8/mulosedumovagarasujobako.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fbc74a919---jizupilegusosuviluben.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00963fb8a---95824305554.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ba4a61a53c---64492553645.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/jotavimidizewodupuwap.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8b3fc07cb198362a974be63de83987b4/5168572300.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160aea8fd89b7b---7511165377.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/dajifesu.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/tedil.pdfIn PDF document text
    • http://atomleasing.ru/media/File/78959016198.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/9543496479.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/firifowefo.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/kolenotiz.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/50843646615.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de5c3a786d3---sezivegapiraduxizalab.pdfIn PDF document text
    • http://ausafe.net/images/art/files/nilejubesa.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/e04061k16grf4imqr41cths1e1/82488680647.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/nilufedumemam.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gnsqc0pbfao75dp3p2ple3a60n/saxuxesapagoxul.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/84038528670.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/kapokexaxo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607714562cdfe---3994844089.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e842e0f4---54839620474.pdfIn PDF document text
    • http://ashioke.com/images/library/File/93692716395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sap+supplier+relationship+management+pdfPDF link annotation
    • 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_off0000b382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB382 13460 bytes
SHA-256: 0a45fd4f2d520fda9a2df598375baf562e8c4c6060aeab01b755d6b427f013d9
font_01_sfnt_off0000d4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 11120 bytes
SHA-256: aaa12b596f283365af7ecc33e4da90eaedaf00d69a41aec4abe7900708b88c99

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