Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7321f5e43cff08…

MALICIOUS

PDF

89.6 KB Created: 2021-06-29 04:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6ac0c7576080e3b935b46e499aebe46 SHA-1: 77ef3c98c6a1d4249fe84e34e71dbb731367fddc SHA-256: 1a7321f5e43cff0856bde1bfc80f6a9b01d8c9e9f88dab605828a67839927fb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics point towards a phishing or malware distribution scheme.

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 https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/7dad9e7b5e2c3eb577250c9476b5d1a6/xupozesivexomamepomov.pdf In PDF document text
    • https://x-software.cz/data/file/xulorusoxujezujukebadujux.pdfIn PDF document text
    • http://rubensova16.cz/files/file/59654573556.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/25607705199.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891ea46f0cb---97280683421.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/kenemipopul.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/2380507968.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7233facc96ae861a6e6a26aaed92a76c/jikasajaximitareb.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/zowewijefufajes.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/jilagofo.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/62340678824.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9783a5a3c---bosakiviwutupizixad.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/56ac53f18479b5ba90eb162e2619487c/tarizegadapo.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5rpo7v544b33fmf9edgv93bui6/3994135681.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/dojeziv.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b845d673b03---goxapimawuwepinuwosisogiz.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ff35107778bd7df46ae61ea6af69ffe/magobu.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/pixawaf.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/kesaripexinonifiwiwadip.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/28280772892.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/jviq8dldfs70nn4qg9o8lap3q1/74590336587.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/trln4nv28addfoguk6m6odsrl0/kisofinaten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=psychology+class+12+chapter+1+notes+pdfPDF 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_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 11096 bytes
SHA-256: d3bd066d40ec914ed329549e3a4f4e08ba9a299e2f9f9fcc44bebe5b861050b8
font_01_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 16424 bytes
SHA-256: 5d1716262691a9768d70883da584ae807d4732dfd510e63952cdde53604a3059
font_02_sfnt_off0001412f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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