Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d27c0137283c446…

MALICIOUS

PDF

77.7 KB Created: 2021-07-27 15:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02af6444b9cf23a314c640efeae99be0 SHA-1: 3c5e455fcdb597050a4a70b3c0e1685771b4b970 SHA-256: 8d27c0137283c4467da34e11848b6186d8943d5d7f2bc465dbdf45280a435d71
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, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The presence of numerous unknown and potentially malicious URLs suggests an attempt to redirect users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/60afdd8404d0230f27fb412598435ec4/79923075496.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606d36a304e60---27872297144.pdf
    • http://asavn.vn/uploads/userfiles/files/71785160017.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/v0nf3gcp7bjn6rm0htv6cj0lsg/molavorosexevasinulis.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/46441f7a14e7eff322965d6e9d07f7c6/zowetolafakozipupikotopu.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/39634720121.pdf
    • http://partnercable.hu/files/4412257014.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a9bdaed49---sagezamamexek.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/pebunafixolagupitim.pdf
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/28066232058.pdf
    • https://derey.nl/app/webroot/files/userfiles/files/nejufezotijipuziri.pdf
    • http://mkngsp.ru/upload/files/zumesivezaxo.pdf
    • http://summithigh75.com/clients/867147/File/6428652819.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084ab39d3aeb---64778313876.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/bee937fae1e120c5abe6cd7ae938246e/54004493303.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607b444429ed3---lujanal.pdf
    • http://buergerforum-tirol.at/file/29333773482.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/e1a3d1191ae4t6n5tv2o772l01/jeligovedekirelosag.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082c9a83656a---98333438103.pdf
    • http://sciattella.net/images/file/sobixafupa.pdf
    • https://serwisnawigacji.pl/userfiles/file/46913494531.pdf
    • http://aliceinformaticasrl.com/user/pages/81066293699.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tere+bina+jeena+saza+ho+gaya+hai+remix+mp3+download
    • 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_off0000c96b.bin
24c3c919ce7f4bfd0aac50f267ab1c8ae201710aebf0388e913d556ec026593d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC96B 16316 bytes
font_01_sfnt_off0000f408.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 16792 bytes
font_02_sfnt_off00010c1f.bin
225ee9b688a1ddf8dbf87cc887eb9b0a13a475b24378f29930bdda7c7f17c504
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 11508 bytes