Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b59bb24d67d3e5…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 17:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eedb260d7de33d1ee76d11e7e3ef91b4 SHA-1: e447afdc494f704578a353beed8cef043ce8b49a SHA-256: 37b59bb24d67d3e5514c2f5e5653168db9c611e3c517ef2852a56890bd0145a2
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 various websites, including those hosted on compromised CMS platforms. The presence of multiple external URIs and link farm heuristics suggests an attempt to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://synerhu.ru/uplcv?utm_term=bhagavad+gita+soft+copy
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/67b4bcbd4b3fffbc99e0f330aacfac4c/62124347915.pdf
    • http://specimport.by/files/files/batamejobe.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/78cb489872ad2c689b1a5e49fd0d697f/26582537847.pdf
    • http://shiny-baby.com/fileimage/file/87590978977.pdf
    • https://esvigo.com/upload/files/feforidikigerotifetizixew.pdf
    • https://hyundainhapkhau.vn/upload/files/sirowiwab.pdf
    • https://bahamianbrewery.com/ckfinder/userfiles/files/12896574551.pdf
    • https://butchercurnow.com/img/shop/contents/91049883377.pdf
    • http://j-club.eu/userfiles/file/29112439852.pdf
    • https://vroa.pl/chplusfiles/file/8173733890.pdf
    • http://halongwave.com/userfiles/file/70905112544.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5637e52c1---domojedorofuwolejedof.pdf
    • https://cuacuonbentre.com/upload/files/35158706145.pdf
    • http://sushinamu.com/uploads/files/81977658558.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/fa794093c09f73f30159a0d30b274874/27397634862.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/vezilusezageli.pdf
    • http://fruitsad.pl/images/file/dasuxezufojoligowe.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132659cd7f7e---91903204240.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331b361daaa---retitolenal.pdf
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/waxajajupidixovisipu.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/2fc3a7f016dc360616d4f476dea7d9e4/wuvuputesegepiv.pdf
    • https://mgc.to/sites/web/upload/files/xevukuware.pdf
    • http://xnucleus.com/members/member_images/files/vomuwebidevavogoso.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/dbeca3baf7e471a5db3462f388966c96/36243426188.pdf
    • http://sperrincaravans.com/images/file/32773762875.pdf
    • https://www.thc.gda.pl/ckfinder/userfiles/files/datenuf.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_off0000dc93.bin
0a63b8c6c1c16dc7406f8251c755630e90147a32f0edf84ef02ce17c61738fa2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 19536 bytes
font_01_sfnt_off00011025.bin
308408fa2dadcaec8539242cec1cc1228d45e9bf713eff06cc6b35136d7cbec2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 10752 bytes
font_02_sfnt_off000128ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128ED 16792 bytes