Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f93460ffc67f18…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 02:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e95f18371f9cf3416e9eca1236fff1f SHA-1: 4a8ee29f8cfe73ed11dc77554a1b40bf7eb0389d SHA-256: 88f93460ffc67f18020018e42a13a670a4c112498be0b60d44a5c77ede0a0797
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous embedded URLs and a specific heuristic indicating a 'Callback phishing phone lure' strongly suggests the intent is to trick the user into calling a fraudulent number. The file also contains links to compromised CMS upload storage, indicating a potential distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ets-sptk.ru/pic/file/64679251690.pdf In PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/jefobitizis.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109030431373848.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/zurekezazadamedusijosusam.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/wopunijewunamebodazapi.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/49727863731.pdfIn PDF document text
    • http://4darchitecture.org/img/all/44525056485.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/79231017120.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c99769721---rujavijunizudafapana.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/moxasepuzew.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613873bf3e4f8---53986637725.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/tebanekinuwir.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164c98c722---54966213027.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/98473692143.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee7b04561e---76033439403.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/58111713002.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/d6qp15p1m1r77scdq3kk18h517/16223407522.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/69052873491.pdfIn PDF document text
    • http://kaies.net/upfiles/210909051356426646w6mf1g.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/xogexibubatogimibewaxak.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec42f01cb---dadejunexojuvexobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=kotlin+custom+alert+dialogPDF 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_off0000d76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 10804 bytes
SHA-256: c40edb5bd7678f5626dbe234b6ceea133c13da2a04384d01604d0832e7c8a7f4
font_01_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 17092 bytes
SHA-256: e4e7326b17e29cdf5f4afa9e43ebd0978bb707f840553569656ac45820d5805f
font_02_sfnt_off00011cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.