Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd4133b8489c796…

MALICIOUS

PDF

127.2 KB Created: 2021-06-28 02:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a67aa83c4d00b9cdce5ed359439c0df4 SHA-1: 7f45ebe71ec912e35fc9774ec0e30a9dc6794c4e SHA-256: dbd4133b8489c7962fe2e787da197901e87421ab6f3f48a0d6594cfff20e05af
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9580d77351---lidejawexozekojoro.pdf In PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160851b81e31e4---nebasupefowufum.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/73554196735.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0f7f7acf303feb54e390063e437474cd/movopipadad.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/40c5ac41be1de8eda0fe3c039489a315/56892682937.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/xopezokipizogivorulawas.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/dd66032be4b24e3b11f5c5cbc98a9bca/gijowutoxoxano.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/besotejimurasidofodojuri.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01e65b8f0e---gexuwakevumapubede.pdfIn PDF document text
    • https://renetravel.ro/images/files/50771896592.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160985ea99d693---pujesuzutomuruguxi.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/mozivox.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f7141d27---31500875322.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a70f0ae505d---jodugijasaditamu.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/224s97pv9pn0d58l4rm83ahka6/96275260800.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/29401456591.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/laramozagosofetowawagob.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/54361769957.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/64365489122.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f886067c00---18799007168.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5fada09f0---foxupoxebunujuw.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/98043438330.pdfIn PDF document text
    • https://yellowstonewildlife.com/95904164086.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/zafedijasomokegogek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=edible+coatings+and+films+to+improve+food+qualityPDF 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_off00018983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18983 20400 bytes
SHA-256: c43d66cc367ef4c94ec32c801475c52d4f579b09f385a100722bd6c89ec7863b
font_01_sfnt_off0001bc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC45 11512 bytes
SHA-256: 1417c953a199327532633d4cc04e96e632f11d923f977dbdeeb462609f9fb39a
font_02_sfnt_off0001d6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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