Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6dab1198be2b8f…

MALICIOUS

PDF

74.6 KB Created: 2021-08-28 08:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeba856ea6b6e95c0b01a03666d50d20 SHA-1: a5f4278b39ba2afeac51cab0f450bbf86f83ac2c SHA-256: 6d6dab1198be2b8fae8e0fe8f1713b71f3d9932a6aa8b52b54697b16f4f428b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://buyyoutubesubscribers.com/ci/userfiles/files/63795980193.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/57784ffc6b139c3c82e93b83130f1c43/68517398101.pdf
    • https://rhodium.vn/uploads/news_file/vevoziwowidanidusikukudel.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/xuxivupojedikotifud.pdf
    • https://bbdirect.com/ckfinder/userfiles/files/80520444473.pdf
    • https://speakingparrot.com/upload/ckfinder/files/wololag.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/cbd3186eeecc85ca7c2630e22add05aa/88651116248.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5900b636cc108927ab9c6dc7a8cc04fc/20259329668.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/2cc9304f0d7c8657fe2a8fb8ea81c0a5/kegewo.pdf
    • https://danfort.lv/userfiles/file/kitijoduwawabonobex.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e94c87a95af---datomewaragavewa.pdf
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/78304313515.pdf
    • http://dolphinkorea.com/files/files/86917506321.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d8590bad---88144193562.pdf
    • http://muszempilla.com/files/file/rumam.pdf
    • http://qtjdb.com/UploadFile/2021/06/27/file/20210627_125652_198.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/42e9ba395ebf6fd11f2c340ce403bafc/3239679080.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609680a1cd431---juxogemonek.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/995ece6e40a33ac51b0b7e12a1c525f1/91863072240.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/b49c85e1270a55bc0f0d3d0e2adcaf4c/jaketewuzutefaligejuda.pdf
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18827138808.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebe18b86ad---78729036833.pdf
    • https://amrapalispot.com/userfiles/file/pixokudefetolufezagaxeke.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+pdf+background+colour
    • 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_off0000c226.bin
9810a1f726338eb779c8096992dbfb10dc36f61bc27b9cc344edf43a9186e11a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC226 15980 bytes
font_01_sfnt_off0000eb27.bin
624c71c08d5eb8cf84d16307662ddae1a58fa4975be779dc8c3a0c535eab21a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 11048 bytes
font_02_sfnt_off0001046c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 16792 bytes