Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c5f6ea782a6d13…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 15:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 99d0a8b8f5fef4600dba32b3858f58ac SHA-1: f85a3250aafdc43a136dcf4cf5f426d85167d990 SHA-256: 14c5f6ea782a6d1315b5efd5904ea30a335e2e17099aa47a5ddd75e0d61b6aed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=double+bar+chart+excel PDF link annotation
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614571b0c9a3a---15660306172.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/sikogilupi.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/90785109397.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/21937926435.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210916081152.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/wumatoximojew.pdfIn PDF document text
    • http://oris-am.com/editor_up/72901751384.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16142b3b837861---58049924033.pdfIn PDF document text
    • http://bibikid.ru/upload/feboxubapirit.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/mepezazudavipuxuvumuriri.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/85967486057.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/kikanawu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141efb2f0fa2---98538661002.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/79995176853.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631942339.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/zositudebidizefasenagudo.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/60409473953.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/gamudurobawiges.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/pilarovin.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ae626854381d414034b7709feec1afd3/jowugaxavudokagid.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/83231888450.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-5/20210905103337350019.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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 17252 bytes
SHA-256: 65162196a5ebb96dd49250104c3761d487e1c8af2c24f3dbe2c6ef6e3f0a191e
font_02_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 10308 bytes
SHA-256: 9342e5dd2fc2580c6bd8166d23922cf629acdcc692242f840f955c26fa398840