Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba69054731e2390…

MALICIOUS

PDF

83.4 KB Created: 2021-07-16 14:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37580c5f9fa0ae6ca10f645b416a1c3f SHA-1: 9d77b4ab7c5f7692c04afedab0fa60b5ae5709ca SHA-256: dba69054731e2390d65a093ba5c1d2bdc616ab33492eb62b03e625fab8bc05cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm hosted on compromised WordPress sites, likely serving as a lure to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be9f0451afc---83986990014.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/2e5krkn2pcna2ff6dncnqp2u85/35858578943.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0f4726955---lajazuwumexenonuwim.pdf
    • http://minhvuongthuphap.com/upload/ck/files/19859766276.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/752d933cae128dcb1b397724981b943f/sewurujeranim.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/60fjqqtcq8tu9jh6k4gnmub1l4/16141506144.pdf
    • https://moveo-sport.pl/userfiles/file/51905652286.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/hh0aqql9grvln4hlttbb5brj27/malizik.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/r1hgldp1595270pgio5mklet7o/rutagijiguwavewagojujigiw.pdf
    • http://sys-svinding.dk/userfiles/file/robinetutimivo.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/58398e7ad62bcbe3216c26d2f3bef466/nuzevojamodexe.pdf
    • http://primaneighbors.com/userimages/26045741516.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/bea3b436ac907832e910b04f595d0e23/zomipolenebodezojomol.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/0dd22ed609db0790ff73540d97888cf7/misefifoxazo.pdf
    • http://abogarestudio.com/userfiles/file/subisi.pdf
    • https://airflow-skateboards.com/upload/file/37708768918.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae4b93492---gosozege.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acd9f6c0ba9---lolagaxeximize.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b48daf776---javerawuwafigabegog.pdf
    • https://billionbosses.com/ckfinder/userfiles/files/xaverurun.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86ee887ab1---70369072642.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38c308fa3---vebeperozaxatubibebiduwog.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff58a6e7d---55445873951.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=front+of+head+headache+meaning
    • 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_off0000e6da.bin
ad0a560f2fc5a67f7b5bb1fb69ba3e9522a82aaef407dcc46143aa9012e3bca7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 16104 bytes
font_01_sfnt_off0001104e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1104E 16792 bytes
font_02_sfnt_off00012865.bin
385631871809c369b846e4a344f902e238fe5a95f60bbcf124738d58b28f4f5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12865 10688 bytes