Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5173ff898215f02…

MALICIOUS

PDF

79.8 KB Created: 2021-08-27 01:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1209165346cbfb6f5f2d492df73744ec SHA-1: 50aa72b46d4cfbc148018a18c2dace2d1835a570 SHA-256: e5173ff898215f020b45febf97c7ceea05593dea0b1f7766166cde34b4a1a7b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b356844a2de---fajativivim.pdf
    • https://lenaoyunlar.com/calisma2/files/uploads/koxebinozujekuza.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50536bfb04---8304327371.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7d05903f3e7f42eafde5964d72fabf48/bulejomurosu.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a7191dd5db3939d14b6223aeaca33fb4/wuwikixa.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a4460759---35815773957.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/986564f97a640db6499108d1bfaf43e0/vewilidetixetosi.pdf
    • http://nemochem.cn/upload/files/49475446694.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/faa7849c8d34047b0460106a1086f769/6736285357.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1f180a1cbcedb42cba2d04d2f81e0e60/sotinixumoliwajisujosi.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094011924c39---9861286738.pdf
    • https://butchercurnow.com/img/shop//contents/57679924052.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/41a6d04163e360fb0639563dc3ab1f31/99261282553.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/637vbradm4pohd179a6j3je1sf/92186766225.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/97782a4c68aaa98731414b0bd9f3f66c/79565769451.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e359cb7b47---21467684180.pdf
    • https://qqhanoman.com/contents//files/melezabafabexopogodeg.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5n84aekmrp9o45rbf8rlmhbt64/41743834140.pdf
    • http://gyndoktors.de/ckfinder/userfiles/files/97044874892.pdf
    • https://rybczewice.pl/userfiles/file/raborot.pdf
    • http://career-id.org/ckfinder/userfiles/files/majiluninemonojik.pdf
    • https://minervatech.work/js/ckfinder/userfiles/files/govevom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=aviatrix+exam+questions+and+answers
    • 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_off0000d41d.bin
3a1eaea26db0b5cd94e18c363b2e6633d45f4216c05c5c2d509cc41afbdc89aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 10844 bytes
font_01_sfnt_off0000ed08.bin
5fffa0f017fdd68b46a56c027b42808d6602f4bd7b81a18c1a00c4d5ef3725f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 17000 bytes
font_02_sfnt_off00011977.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 16792 bytes