Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c102f483b85385…

MALICIOUS

PDF

92.0 KB Created: 2021-07-05 06:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fbbe5fe60f1c1dd1cd20db092ba261e1 SHA-1: e8d5cb0fd492fc898b0cf8929cd96af5930d7514 SHA-256: a2c102f483b85385d0bcfafc8d89919b3cbe47004ae648f5dc2579e444e4fcb9
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The document body is unreadable, but the presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://avenue102.com/uploads/file/9344691460.pdf In PDF document text
    • https://alamansyria.com/userfiles/file/widekipozuvogixisata.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/63ba96e4c891294dbf2a6012082e913f/93047804034.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/42632702999.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3d986fb64---68537158541.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8d78b6cf---73484365770.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/96b07c41c3b160ec3f6090fb88f69ed7/xezaferetukurogulopakoka.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54fd29d5d1---bamiwitujemovuruwod.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55d1e80aa---xoviwabovumudat.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bdad297ef---18478898833.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/lejosararikufazinatoxefu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f0683e1a---bedotalixojotaw.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a27e3a6fc7fd6dc632769469d5c80e3a/zikarugurufixogajutor.pdfIn PDF document text
    • https://naoshima-habitant.com/rukojovu.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/53461445036.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8q0bracth8vpbd7p4nde0q6go1/wutanatanona.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34cf0b07a---85317806589.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/78515303218.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f8238ced78fbefd64ec4f104b0f86906/14937454175.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc012e0468f---70354555509.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/82608634834.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/41391797939.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/30168365382.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/98999999953.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/nakuvotusebepuwodalose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=deco+type+thuluthPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013785.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13785 23996 bytes
SHA-256: f477248bae75aa8cf01c8f255d0b9b763df8b160d2e4b8f6183bb3d729441dde
font_00_sfnt_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 10060 bytes
SHA-256: 89e7225b741664587046d8eefcc86c5ecf3415a97c8fb9747a08e58f3a40cdbe
font_02_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 19652 bytes
SHA-256: 77aa130b2c0efbb40edba04167a924ccef19739bebe848192035a17b681b0213

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