Malicious PDF — malware analysis report

Static analysis result for SHA-256 88deaee1f96defd9…

MALICIOUS

PDF

86.1 KB Created: 2021-07-08 06:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9fb1b17d4a808d8022f1f0b3d4959eed SHA-1: f3ddb3a8ff7eea0a4e9086dd3aeae20fbce02a2a SHA-256: 88deaee1f96defd9d0873a83106728a904de31c79b777870c14bb676d36fe8d3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains embedded JavaScript and presents a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to host or redirect to malicious content. The presence of a callback lure heuristic further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/939bb03bcf251f6741b796cfe43673fc/zofot.pdf In PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be5398c70f---29382855232.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f231119430aaaa6adbb5908b2414f70d/wujemoxoxemasasubemomud.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/muduvurekofoja.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/13585841100.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505193132359629.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0ddf2fb05---20015008164.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/bbce2a8cd0d0da01ef46ef948926e8f1/5234738066.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/73713938182.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160712a6c13137---kunir.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/44cda5e13b5067790e0ec7ec714dbd09/jesabaposadi.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0c30e28e---xegizefebekexijomusuf.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabfe4e946---bawipopijelajibagaxuxove.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609405da8ad4d---52205159441.pdfIn PDF document text
    • http://drironcat.com/images/file/22315784545.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a270a5859---fonezedotar.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-21/20210521072126155297.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tlct828hc011v5kk8d4mb7is8b/lokafolanoguzud.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/deladabapofogebakotel.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qrb1o66ifpusul4u7qfkk8eri7/75343551466.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6bcb3cdfd861d9a2173d42a312cfca7e/fejamo.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/fisulemitivoxozejinoku.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/pajimudomoxikikav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=voice+changer+app+from+male+to+femalePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f7cc90c9ae2224306f2788db8ab80e62/74131664043.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_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 17004 bytes
SHA-256: 9e65f1412fea3485b8a770dc01253fe9f22d8e5a48950775ef82ba9c3796d645
font_02_sfnt_off000130e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E0 10728 bytes
SHA-256: bf3f8055169182d002ea57acdb7427ecdb442380f5a31fce26f88afe4d64009d

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