Malicious PDF — malware analysis report

Static analysis result for SHA-256 753b01ef39ca79ec…

MALICIOUS

PDF

86.9 KB Created: 2021-07-01 12:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65d25f481f7f74276106f6d40f232195 SHA-1: 8b93807867086851e7c4208e12321df1f53d67bf SHA-256: 753b01ef39ca79ec26923d08eda6fa53483f9087287d634825948c85b9d4cadd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a lure for phishing or malware downloads. The document's structure and the presence of multiple external links suggest an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5f8908c1d---vinixurugitofopodupuz.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e8b13e9f80726a6ddf54924c2fc2c05a/melewanozadurelako.pdf
    • https://artenika.pl/fck/file/selazabezifedul.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a41c0b9ee6015c2e77013011f09ebc1e/kazetezofimobosirogufog.pdf
    • https://amblamy.ee/upload/file/82206944382.pdf
    • http://k1a.ru/images/files/file/81637950664.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/606361a4bb67df036e87e33d1b22aa71/78348260431.pdf
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/popidigubagibunebigogas.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc541773ad8---foxiwomabozexosikime.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdb0239124---55632949714.pdf
    • https://magatek.com/documents/file/12863140237.pdf
    • http://tcihk.com/userfiles/tozidasubuluperilamak.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/78b4fb53e9520e2ba475aea8fefc60fd/sokotaxub.pdf
    • https://unicon-msk.ru/data/files/rasuzevagisodadamakum.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/79c3d3b002da39ab5a6c2444069c7e01/pigolizezojuwopolikej.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f63a7ee4c---xowenoviwusulutikowogagi.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a4b7450f5---21239496242.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/77460026239.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe2437419---99444549390.pdf
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/d13a8be56997fdf2ad573a302455fed3/71372760239.pdf
    • http://jshtextile.com/UserFiles/file///81764683646.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=my+eyes+are+slightly+yellow
    • 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_off0000f04f.bin
17e4da96d2239a78b75d17c992fe2f1888da0ec1c2f4bd8783fd986b632ab5bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 17184 bytes
font_01_sfnt_off00011ce8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 16792 bytes
font_02_sfnt_off000134ff.bin
00e139b5f77938422d0975320dd2ce77e4fb75d3cd41e120fd5048f3916508d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x134FF 10476 bytes