Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2f97c78de1d78c…

MALICIOUS

PDF

74.4 KB Created: 2021-09-20 20:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eae873f50c1416e6aea387ad37f45c38 SHA-1: 77fdb6580389360007e4d0ff6aa11fd2769bec32 SHA-256: ec2f97c78de1d78c4963d4a2b57faa5a3874cb7bb671698074414bbf0b7578bc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URI and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=godzilla+king+of+the+monsters+streaming+canada PDF link annotation
    • http://bc-arman.kz/ckfinder/userfiles/files/20488764194.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/21230835160.pdfIn PDF document text
    • http://metapolar.hu/tmp/47777856663.pdfIn PDF document text
    • http://change4best.ru/upload/file/muzanepakasejopaperedu.pdfIn PDF document text
    • http://snft.ro/media/file/70771004205.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/74086123599.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/levigo.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/domesumaguf.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f72f8c9d19---92524708777.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/kusagidevivegusigiwavigat.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/21e9abe136bf0e72b34292233b00592a/14617260531.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/gevon.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/25758998734.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5udhvt9ctdmi9sr4cf4e2trshf/68334648425.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/46115919133.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/kelotifeguvumunijojixal.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/lubaxasugizuwatobapegelo.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/77259076289.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/12070571212.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/51783254251.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/82218588674.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/wabijibapefawakajuwexefo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/duudv1oph28setmae4l7ud9ma0/fimotubibizetugejutalig.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/kosudotebavamuxu.pdfIn PDF document text
    • 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_off0000bb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8B 11116 bytes
SHA-256: 5aaa4f50d97a6dfcc0fd504f4f2227b2c6f645b30b63e9d165f27762e62c8181
font_01_sfnt_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 17916 bytes
SHA-256: 9e4b05c163e5cc243eb067b91c0123cbc741d9dd413adaa86c29298ae11acba8
font_02_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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