Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8c1ffbf0991d6c…

MALICIOUS

PDF

78.4 KB Created: 2021-06-29 21:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79f356f9c5628d76122d6ac0b628f267 SHA-1: 09f9c0b784f17f143cc7ca2f3dc48bd16a844914 SHA-256: fe8c1ffbf0991d6cfd1fd5cf2d54ec93ed9af2c68571be13484dc63d4402e0da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. Heuristics indicate the PDF acts as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e8063897a---35612465774.pdf
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/fetamozenafabagamerewu.pdf
    • http://dansecyr.ca/pdf/file/logavasanewodukedox.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/ecfd4a7429ba0c3b61de49928dd76703/zenoxixafawirovumexojugu.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/5efcd808910650910841df8d3cc00e06/lizemesobelemaroriloxivig.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9161d6156---54012893094.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e7f0c9473129de5b0750b0562bdd4733/43291027138.pdf
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/71361061527.pdf
    • https://audit-advisers.com/userfiles/file/46945702163.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/sngeppenfbkrnpvk1tnri8l95o/98083127083.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098524988a0f---dokokuzobod.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d5c4b4542df8fadc10d6d76fe85fd74a/19795328504.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e92c9bf084---wamebulewawuderigo.pdf
    • http://beta-rc.com/upload/files/60482740072.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/s21j6nftcr6v9vl6egssurrs71/38709417831.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c891efd6---6146863916.pdf
    • https://hiperaktivite.info/userfiles/files/fabugifekexaturiwiro.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badccbb6e8a---66989529343.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607adae4b3837---85622215049.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/9431991181778b67ee9c3c4261e952ff/fezozatelukozerajafu.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/n14n5q0hujtv7lp7t55aq9jfr2/wamos.pdf
    • http://gyobel.itpublic/file/10532148081.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b0b68c4ca---gajidudujodibogut.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=7000+aed+to+gbp
    • 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_off0000d1ef.bin
c43af1eaf6822649b12b2ccd8c505a5f1868c2df61297cde56eb9c70d54efe35
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 10272 bytes
font_01_sfnt_off0000e8ac.bin
6355c9b7f070937e33810b8b40e2cfbe04e91f35004c44c72b07251a964cf1b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 16872 bytes
font_02_sfnt_off000114e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E1 16792 bytes