Malicious PDF — malware analysis report

Static analysis result for SHA-256 9112b2c1652f0560…

MALICIOUS

PDF

92.5 KB Created: 2021-09-04 02:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f42b4ebbf92e1df089b5459056ede4ac SHA-1: af6464f4a4cd5d208ffc576a4d70951727fc0575 SHA-256: 9112b2c1652f05604b313991723e515faaae114adecf83302b4a6abe9b28c7a8
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. The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures, often initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608712ef042aa---43290453349.pdf In PDF document text
    • https://bloomeng.com/uploads/46121603976.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/cacj5bp2mu6h4b0eqo50m0b9v9/51545879413.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907b2fb6876---gosasuto.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607070f1276b0---55072664413.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/8gr1n4pcut8jbbtoat7u9tcum2/75201182124.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/kezutiwadob.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/36601902951.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741ba44133b---70548855931.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/19681899582.pdfIn PDF document text
    • http://planetamama.ru/files/file/fafubivifotilumosiv.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/gasozug.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/22104689430.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/zosalemonen.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/88ffed83e5e7be81ced7cdc3d76f3145/47024986033.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/3312f35730239be010af52d757c8f9b1/tesonoweni.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161163189c87b0---87113285203.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/5208284787.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/dozekiw.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jg5im6ivjuao2m2ua2mtpfmmpa/37489169641.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfedb45f3a---33660604009.pdfIn PDF document text
    • http://carbonelite.ru/file/22786215519.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38e9dc5935---23084729858.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/61716460889.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/50651541489.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/vulipubugomebumojut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=theatre+of+the+absurd+characteristics+pdfPDF 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_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 10768 bytes
SHA-256: eeb621a640115807a7cf7130d6503d81560f55c5d27806a72f6ae5c265ceaf27
font_01_sfnt_off00011ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D5 17312 bytes
SHA-256: 68daa069fa6b11b2f234aa1258727d1802857e03e9e4522bb8536bf72abd3146

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