Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e505fd4684c972…

MALICIOUS

PDF

89.1 KB Created: 2021-06-28 18:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55a8e10f268d13b5bdd1618ea1bd0c8a SHA-1: 6cf15088e7eafe16bed87e4aeb528626276392c6 SHA-256: 20e505fd4684c972d3b51d79d04431365e42e7ae5ddd1210a3c8e8e7432000e0
156 Risk Score

Malware Insights

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

The 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 URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. The PDF structure itself is heavily obfuscated and contains no readable document body, further supporting its role as a malicious container.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zineziga.pdf
    • https://trips-in.com/ckupload/files/39487353687.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607c219434980---87397797936.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f762720bb8---lepapupe.pdf
    • http://anhbanglaw.com/userfiles/file/4066706197.pdf
    • http://cnzgks.com/userfiles/file///limatubibufulid.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/72vg2c4qdocdk7rrpqg403o4tc/60218243143.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/37cd524a90712bf731fd5cd16599e728/zusudunazasezelutazovuwog.pdf
    • http://jyjwqj.com/uploadfile/file///2021061216361336.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160777fb8a5b1d---90036213886.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa675ac7a29---81792794342.pdf
    • http://kfnmsz.com/upfolder/e/files/20210624152322.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/379d7c6318e793c13c34a0083efd6fe4/jutusez.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c40febb1f39d841596a8f83a48ddf757/motuz.pdf
    • http://t-p-fortune.com/userfiles/file/kupafabogi.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d2a49241e---ruwamaf.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/35ba139cc37f893f50319abd7a083c57/87452183971.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/wudasode.pdf
    • https://liniagdanskzydowo.pl/files/17726220760.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8857768472f7a235cd5e37ca3e3a257c/xubijelepogasulox.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a8a715f974f4a994b9a99cba6d742632/76677885172.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/743f4de14302f90ab8929c2b4e1edaff/pulatonatuwiluxov.pdf
    • http://airfa.it/userfiles/file/77361693417.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=identify+geometric+sequence
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 16792 bytes
font_01_sfnt_off0000faf5.bin
325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 16084 bytes
font_02_sfnt_off0001101d.bin
0aacfe693b52cba2f189a5b00245d386904233aada77985ac4cb2b3c770ad374
pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 16892 bytes
font_03_sfnt_off00013c73.bin
0a01fe593aae90b27873f3bf15f69d70304b4d44f885ad7a960c2c2f21d4317f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C73 10924 bytes