Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e4b7ce97a1e814…

MALICIOUS

PDF

88.6 KB Created: 2021-06-25 21:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e37024dce8b744c0d8055eb3880daf82 SHA-1: 838fa68874e64a7702db1cfc6da6f36053ed2176 SHA-256: 66e4b7ce97a1e8140335dd8cd39056443ee3aa0ce2501c6e6c7d14f62a040694
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c81dfd596625ec31992855c35abab877/94325521303.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6048deff93---bisisajepupa.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/q2b8lnt0j189p6mfq2i2gch5b3/seduxiguwijivumuxifid.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/nowagigorutatut.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d80031a69a---xedexatewoxotiwoba.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/1351461081.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081831a2b7b6---segilimulolebewi.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/b422a4293406fa51c6806150fdd82faa/9726021294.pdf
    • https://bednidhitraders.com/userfiles/file/xoraxunamux.pdf
    • http://iphysiology.ru/upload/38857802686.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a6e771b89460e2730e47db3279a7225e/bupumenozalimukev.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/de4fd01bfdb915d27e1da5f001e15515/munivalebofojijor.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/xonudiguxu.pdf
    • http://ifa-astrologie.de/userfiles/file/wixadasexamopunowe.pdf
    • https://topjobsnepal.com/ckfinder/userfiles/files/11653430618.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608873210dfa6---dasujusoseravebesaxe.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6031d1a2b---48782474291.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b80d86e1---34061362538.pdf
    • http://imhkayseri.com/resimler/files/49864369029.pdf
    • https://accuratesearch.com/userfiles/file/57350035841.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/pkf0n01a8p4q2d42d4t3drvirk/retusuwuviwasuzumas.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/kmv59ri1au63ht25loodrlqrb4/pubufumigajabob.pdf
    • https://chp-travel.ir/data/file/toleberuxenogawile.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607517087531b---80671023758.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=poem+comprehension+for+grade+7+with+questions+and+answers+pdf
    • 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_off0000f56c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 16792 bytes
font_01_sfnt_off00010d7e.bin
9cd525dea4041c4442e094b645e9c1fac425a79f566c2f2cb246ff6edba4de78
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 17212 bytes
font_02_sfnt_off00013a3d.bin
f028680398f494a5548dbd0fb4bf7eb43f45f2c8eeaef0b81c4cbcde3f151535
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3D 11404 bytes