Malicious PDF — malware analysis report

Static analysis result for SHA-256 888e65d100872895…

MALICIOUS

PDF

89.1 KB Created: 2021-08-05 12:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55849e46ec8859cdf250b9c01b845adc SHA-1: 299c4bc84ed4d5d8e49ca38972e399e23e455fd8 SHA-256: 888e65d100872895c5ab980956dc48a269c37fee39ed21bea9af195de685258b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting. These links likely serve to redirect users to malicious content or download further payloads, aligning with a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988078643be---37309471600.pdf In PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1025475b0---rovusugokuwixuvizukit.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1609e29285b1c21eca28d5bfea8face8/kizefoselovubofapopi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722a9cb55d9---10658470033.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/92676752958.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02b19de39---71711571838.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/f6c3135082364a0b4fc78c4bd926738c/87711126395.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/88afe8f906a693547003f6bd208e652d/pavizimavejojaredafakad.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/83fab7e3998d29e77d6ff5525da9ca4a/12067413012.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/59158845996.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/66015205612.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/63084629575.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/37588048444.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606d481f1f23a---nabimizubinitoxewexele.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6f5d1643a7892667ad85ffcc81e87a0a/94053036401.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/jusibozalikojazeti.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706fae36bca---93528129465.pdfIn PDF document text
    • http://waltripclassof74.com/clients/8/87/875eff38522a6836d9fda94c5a2b6b26/File/7775931479.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210725143524.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/ludagofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=lsu+football+workout+program+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb6b206ed1---jejud.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_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 17832 bytes
SHA-256: 9a8ab4fca7835384905daa963368aa515952023cf1e444727b599589330f1f14
font_02_sfnt_off00013c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C84 10888 bytes
SHA-256: 1ae3399039ddd99f8c6537c1a727af6094ae3de54e474446b0c0ab217a241e91

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