Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbee043d74dfbbe…

MALICIOUS

PDF

98.6 KB Created: 2021-07-02 18:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f0903813696dcb7f2d9cdf179c56929 SHA-1: 1387f8fedc126795e336e16f69b250681163ea8b SHA-256: ccbee043d74dfbbea02601b817edc2d72f907d78d8306a5bc6fff5da68cef61d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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=get+the+word+out+synonym PDF link annotation
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/igltgln9rb9homb305nlek8dsv/tefamulakitufibidafabefex.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/70276013027.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/pesidujuwozudafozur.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/nakokonikiwokamukarapef.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ad0d506bcdead94f13405343b5a87880/96142289488.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608324a2d77f5---pawowojubenisugedu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2ea218f5f44e05f3fad57032b699ba24/43695511444.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160796294e63a5---98363350388.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/jf4f95anndr27ub5pb5cun38i1/papofalule.pdfIn PDF document text
    • https://diphong.com/uploads/68978977099.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b642b7fc6a---46516136234.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/1868340fbd9fdaf5336f2f4a033c2aae/3657618555.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/bimofuka.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/bakenisijolekoxelivizufi.pdfIn PDF document text
    • http://ortetel.de/kunden/schurig/ckfinder/userfiles/files/89828390143.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/bedeferedir.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/t5nqh8b2eo9q72o0o0far3lj0u/dedodorugufegojuxuvukika.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073773be3188---beludokujamagakimume.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/d22qqfrajj559dmuaure3s1vk6/63112395179.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/547097355.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/al0en8g7mcuhrufilttp9k8cfs/jiposuziguvojemo.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/kuraxokutulowomem.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/69908866611.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_off00011d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13574 17848 bytes
SHA-256: 4152107d7d4aeac1e576943d6277de4880c43ce757b54777fccbbc5251ca0ebd
font_02_sfnt_off000163f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163F6 10552 bytes
SHA-256: e1f687b976b7b52121626d90a608f49396428423cc0d67128526a38aee8cf4d4

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