Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c3c1320aa74ab4…

MALICIOUS

PDF

90.2 KB Created: 2021-08-06 07:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24e9b4406457d7e8df55230f9f208aa0 SHA-1: 87fb8eaabd719575d4a23ee3afbd08cd8e546d5a SHA-256: 26c3c1320aa74ab478323cce3b5f9a0e6b54786cf001f5f02f6b8804bde06f97
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'Password-protected archive handoff' heuristic indicates the document's likely intent is to trick the user into providing a password for an archive, which is a common tactic to bypass security filters. Several URLs pointing to compromised CMS uploads and disposable hosting were extracted, suggesting a link farm designed to host or distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab10f5d9b4---18394725947.pdf In PDF document text
    • http://sam-global.info/files/file/27038668496.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6bc0e78ae73412d35a3440f3c02477ae/dosijugomolivetozowevon.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/97309231603.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/dpd51aldc50b51ofk52a80mcu6/wukitile.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/zafusixamudojejitikidig.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4b66207a90e0186ad7f9b4c71141de06/34884820988.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/tjpcpfbhoghpdv0c31pn5kg5d5/wepusozuwojerit.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/45174444973.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/jixodejurujeleg.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/96576362059.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/jn18rpcsfsuhrmbcufqq5rdsk3/zunekoziniguji.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/25551336881.pdfIn PDF document text
    • http://jcpingie.be/public/files/89225327501.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/12475462035.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610046fde82bc---94137156035.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/90562232565.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/rijogewaronog.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/49543142465.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/gunekamivivoladakosop.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/6405362887.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/satirijakif.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb4cec3f16---sanidoburebobiroduvorimi.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf9679f14---momopinu.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/54373408050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=rar+password+remover+apk+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 20340 bytes
SHA-256: e03750bbe2f29e3190d7f7565d650e8e7b82a5caca77d21683f8062a861e113d
font_01_sfnt_off000128e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E4 10756 bytes
SHA-256: 8162ca9a140de255f300e99637ebbd4d9e9569f0ee03ae22aff75532255e36b2
font_02_sfnt_off000141b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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