Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae98d3b88ee2d9c…

MALICIOUS

PDF

88.5 KB Created: 2021-07-06 21:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb5e98ec457a0c3157ffc7b9f6994929 SHA-1: bfe699c016fff4b79620e43bccbe3ad4165dda09 SHA-256: 8ae98d3b88ee2d9ce88848ead232dfc2740a6f294785648c0f910813d3d606b9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to lure users to download further malicious content. While no scripts were directly extracted, the structure and heuristic firings suggest a phishing or scam lure, potentially involving embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 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 https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710fb586aa5---sigolovufozamuzad.pdf
    • http://www.darvidproperty.com/news/file/48802565922.pdf
    • https://eyetracking.pl/userfiles/file/86608865090.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/446ae9ab0d1f709041e314272aa17d77/malibaxitez.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/kinidisebiruxeb.pdf
    • https://jxloanchien.com/style/postimage/file/34367002335.pdf
    • http://fsoa.cn/userfiles/file/44453382826.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2a2481aa0578df841db46479354dfedb/55503077683.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2493a8e7c---52051405686.pdf
    • https://gulyaskantin.hu/uploads/frontend/files/397943299.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/55a18df87efce4b66d7dcd6bff09cfd6/29718135180.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/tuwijiwoduwega.pdf
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/63102874304.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b0dab0f71---91020816285.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87c08b7d5a---91541473295.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4318590ae---29448992643.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1a6e29d390c1c146413903e35b2f71b6/10307701303.pdf
    • http://xn--m1age8bh.xn--p1ai/files/file/gufalununam.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/tisadexide.pdf
    • https://warungmimpishio2.com/contents//files/kejela.pdf
    • http://crosswaysrecruitment.com/userfiles/file/42188340845.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1311af0917d742535930a52b940dd5f8/31876791774.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ad53a5qg24huhepihon6vco3c1/bawitefe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=grand+star+istanbul
    • 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_off0000f5d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16792 bytes
font_01_sfnt_off00010de7.bin
e68eeac091376eeb7ce81bfb0313f3891beff9638574f7e9ed26b22946091707
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 10268 bytes
font_02_sfnt_off0001250f.bin
8606cef59af6c69f3d9791afa608b54c232a576f8e709cd10a07e3919296a47f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1250F 17780 bytes