Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55c235b91ac8e30…

MALICIOUS

PDF

87.0 KB Created: 2021-06-27 01:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edbc7221b5ccb7f6440ade8e063634a7 SHA-1: 1c38fad585cd50f4491f86f039f41e8f9323964b SHA-256: e55c235b91ac8e30babecae447006205c020144996587d79ad643283e9006b4b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b731c5e902f---39142816180.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/xejezibipilisusawibiwol.pdf
    • http://blevy.com/ckfinder/userfiles/files/40741305162.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160756eee4fcca---81415135644.pdf
    • http://balone.net/_upload/file///lefatepebelikufe.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/694l6470up8paa3ffnvsmibpt3/18287728961.pdf
    • http://ck-kutnahora.cz/gais/image/file/riwimitutujatilobizapibur.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/lpmbo1egs7j6p7tenvnmpkp6nm/mejafatatetawogoneta.pdf
    • http://littlepearlspublishing.in/data/eimages/file/kogawuwokixilozoxanajowip.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/eabe4ed01dffac5733ae8eb0bab7a1bb/tanikamurudi.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/f602c4352af7d904e7da9712a7db62df/datofadidagisa.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83cbda6bf---75196869781.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/fotefeviroxomavogoto.pdf
    • http://blpest.com/UserFiles/file/xavete.pdf
    • http://mhinflatable.com/upload/file/89192987932.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///56110961508.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1745d9b9352b721529648dcf694964c7/borenevefipe.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ksnnmfgfij4vlje783ril0h9c4/99550533962.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f085ad865b---nobimewes.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbf458b6d8---peror.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e504b47ede---91489795731.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9218b1e649---87668690684.pdf
    • http://katyababash.com/images/uploads/file/63733788569.pdf
    • https://serwisnawigacji.pl/userfiles/file/83164383915.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+counter+depth+vs+standard+depth
    • 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_off0000f0ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 16792 bytes
font_01_sfnt_off000108bd.bin
b39b06849904094ffb388c9932fb3fdb87017aad179180b5bbc5b5a260357cbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 16780 bytes
font_02_sfnt_off0001342a.bin
eb10eaa07f4542795db07510bc8f95a7ec34fc0821f7a7a72182a2b2ee47939f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1342A 10724 bytes