Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed820a59d71faa63…

MALICIOUS

PDF

88.5 KB Created: 2021-07-02 11:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b29581cd83f68c944ba701a4dbcc449 SHA-1: 491d3c8d282bed26939a74f80f7e783326a35c9b SHA-256: ed820a59d71faa635bcdcb0554abdf5aa3605dc1c8c375f74101ae5cf6db3393
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to potentially harmful external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ca7f8b0e5d37212efe2bcad614d1cb08/28095338423.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cd0a62af3---24325887720.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/f1v7oe33a7ofcmfaev8qe6hiud/44005947243.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7569e14c4---xifonuwusodugetanumowu.pdf
    • https://seripin.com/calisma2/files/uploads/lunudakom.pdf
    • http://caratow.nl/userfiles/file/wadiwevewenijavinapo.pdf
    • https://anthonygillant.com/userfiles/file/lasijazafomegon.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/23262410956.pdf
    • https://avgdesign.com/userfiles/file/28672645724.pdf
    • http://homeopathyhongkong.cn/files/xurufuvifizabapokevizot.pdf
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/voxajawobuvowag.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/4137f082d620ba1d00c5d60b290f7c7d/42281902123.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988856ae90d---falilele.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ecfb7e75080eb9cbd41d23ea72d77be8/82424711429.pdf
    • http://amphorabeautyclub.com/campannas/file/zafuxubeje.pdf
    • https://rowadalbyt.com/userfiles/files/39326617502.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/kn1ba4ki7l938o31vn4mpmkt6l/bowotiveduzuruzodiken.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c3beb4985---numol.pdf
    • https://travelsafeway.com/userfiles/file/bakuxoke.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/e7f5co2h0v17011e2iuaie0u2q/dodubejika.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/lolukivupesofijirawiz.pdf
    • https://plentis.eu/ckfinder/userfiles/files/35867162205.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e75992029ff4345f1d666c4c8ec8c3e/31823139051.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/282f1ee3caeafe0bd6704f33edfd3828/duzipodagubejatikuwazutu.pdf
    • http://imi.vc/upload/files/gilemadejo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+definition+of+push+factor
    • 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_off0000f55b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16792 bytes
font_01_sfnt_off00010d72.bin
c8297bdc968bbf51d469a2616ce769ddcca3ad4e97af7fc3e15c65be9b3ba201
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 10764 bytes
font_02_sfnt_off0001262a.bin
cb32cbc0cb02cd51f8db9509c94954ee9d031325013869f9f30040289d40950a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1262A 17176 bytes