Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c0eb6125cbfce6…

MALICIOUS

PDF

81.0 KB Created: 2021-07-09 06:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0d1ceefa4b4467122f2adc156ef20e2 SHA-1: f33584bd0dbb807696c9a9006b1ccf2e302a7ef1 SHA-256: 52c0eb6125cbfce6ed9dcf687bb0a9001868d0f3de2d25feca36c8337daa2928
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary attack pattern observed is the use of malicious links to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://classicalgardenornaments.com/uplds/file/satuvad.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/99001733944.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/nemikamoxasutowodaxij.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bba18f9dd---kalinobol.pdf
    • http://agataklimowska.pl/userfiles/file/17307664810.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e866379060---40813448104.pdf
    • http://alkanboya.com/files/file///tamikabaponidavovariguna.pdf
    • https://kildevangen.dk/files/5994539389.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a25e58e4e1f2befee5491b49b65803f2/mapinaguzamumiguripevupod.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/47382651881.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/38154581918.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/84a45f7d820610431a76e9845f554dd5/49471961407.pdf
    • https://amrapalispot.com/userfiles/file/xekogi.pdf
    • http://d4svancouver.com/clients/c/c8/c8601140a4283eb9b700f388a83987a3/File/wadiwupifosomofebakebusa.pdf
    • https://advance-pack.com/editor_upload/file/mesoleguwas.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/jpqrfio8tag26ne467f3d9s6ro/22892541551.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/85e3683175347ea387d65d6ee7807e32/buredozawogo.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d1b0d6257b400230c909846a583216a5/29255201550.pdf
    • http://mobilni-kadernictvi.cz/files/file/59704899590.pdf
    • http://beloezoloto.ru/userfiles/file/lexuguti.pdf
    • http://harasim.cz/uploaded/files/8546064515.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tilobojono.pdf
    • https://anthonygillant.com/userfiles/file/zikijifimiduv.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/bc3417336587f1c363a1e744fc801417/39796648899.pdf
    • https://atcotourismtravel.com/userfiles/file/tubixokifejuwil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+align+two+images+side+by+side+in+html
    • 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_off0000d7db.bin
26e343aa538fdc68e662d0d775c17408610df7b3b51de723970fb167fc607231
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 17396 bytes
font_01_sfnt_off00010509.bin
1673b228aaabc742d41cc83c1dc77b429d7f575bb67ed606ee734612b2704b53
pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 10928 bytes
font_02_sfnt_off00011dfa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 16792 bytes