Malicious PDF — malware analysis report

Static analysis result for SHA-256 14db1f64752cb025…

MALICIOUS

PDF

138.7 KB Created: 2021-07-30 19:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f73d3370e59a68737bdb1f2c9651c76 SHA-1: 5378080a9f7760b816311b4c9f16cf0827a01e3f SHA-256: 14db1f64752cb02532bdfa4c5740736bf6bc8b2a31a15b416407f12ec0d51e5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the link farm and the compromised hosting suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/bc187ff6bd3998d2568712b048dab515/dirakodonas.pdf In PDF document text
    • http://rapet.hu/files/35689475329.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/39c2338c59aa8a6c5fb042cc52f4e253/7873281311.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f157ebc752---lifajaxa.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160903b07f2540---wisatunasamezajonogut.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/vusupigajaso.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/8089200437.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c77f0020---73144228303.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/fodoboraduzujivon.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/piziwav.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/9998154141.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/fajodisepa.pdfIn PDF document text
    • https://lasanisports.com/files/mafas.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a7da1b315---lixojogiwilivisositejofax.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/28roehh2375f11sodo9gfkou2o/jagepavawexovalutozomemo.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/81403320232.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c1ba33a3---17773768984.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f87f067db3---vomosisexiniw.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/nesoremariv.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/14512433807.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/tezobiboxinitizivekal.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/25069520978.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vobepokeporuturajina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+does+temperature+affect+enzymatic+activityPDF 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_off0001b7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7CC 11152 bytes
SHA-256: 7c205450705ee462b9698dd5774406f34e4ebf75541a15410f97c7e544fa4be0
font_01_sfnt_off0001d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1EA 18648 bytes
SHA-256: ead2dd28fda16582ac68d0ad20da6fc22a3a4f73d6320e7060060787f60441e7
font_02_sfnt_off000203df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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