Malicious PDF — malware analysis report

Static analysis result for SHA-256 576cd565ec01b187…

MALICIOUS

PDF

84.0 KB Created: 2021-08-08 16:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c90555a5c3498af04bad7fda93df0d6c SHA-1: 2229deafd958e282dfdaff989860651b17ae70a8 SHA-256: 576cd565ec01b18722efbb8b5188f85f96589fcf1934e8f4bdbb8e7013d6050b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress instances or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to directing users to malicious content or downloading further payloads. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=memorandum+investment+management PDF link annotation
    • http://ohsongpharm.com/ckfinder/userfiles/files/31872423369.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/kmucco7vgf685592cr3hr2cdlj/52780544541.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/8738317980.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/kenulugarew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c346ef775---38814845777.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9d40533ca---83922201919.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9217688f0e91dcb1f9d0805dc4c32f40/gegudukuxixosutomurar.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076af7cb7e9b---wajudometatar.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2807164478---jizusiw.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210801_052719.pdfPDF link annotation
    • http://burmeseburmilla-allevamento.com/userfiles/files/gozixavupujuxev.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/76561255758.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/18478883165.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/et79pl2b9g620pm1n33t1jmbga/xigubejizukekadojosu.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/nufuliludaxirakov.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/lezaxoxovegotujobej.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/apilibebinemudi.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/pitumu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/armf1app3mdmaeg0g95md9kc44/64952109375.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/tumoxisuledewove.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/fifawovavedujowasu.pdfIn PDF document text
    • http://weingut-suppan.at/files/24953812629.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7690d58a3---wozuwotufovimupipo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l9l02mva28985q0b0lgbe739nd/jewusulo.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/fopulefa.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/53804119718.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_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 10704 bytes
SHA-256: be53d20859d859087fe1fbd0022cee3a867e71ff1ce5768dacfaa7a621d12b81
font_01_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 16840 bytes
SHA-256: 30df21bf805a9e3d23e962475c2218c908fd0bb5c76ee9a00bbf24aa7358f599
font_02_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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