Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c8aaf83d5831e2…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 08:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 684339b9ef57454291327d724817f434 SHA-1: 6e811799111e97447bbb0c7e438c98cc20629092 SHA-256: 38c8aaf83d5831e28b63e49ac23cacaa4d5b54b2c3475d21da9ca63d558f990f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/fimudanogazikiro.pdf In PDF document text
    • http://fitsiluet.cz/data/file/62960994168.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/kevagujelaxugijakorubenob.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/21700996185.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/9713782909.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/temitub.pdfIn PDF document text
    • https://ebooksweb.net/files/file/rutunexu.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/71588553253.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e72d80360---265535344.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/megazelugurodokifeturunaj.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5ba47733cd28bc78bab8a2fdb349eca9/verefeku.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/tezozisefusarusibalo.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/7108676089a017068dd8e551de9413ce/zurigegoronozokaruvefofa.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6efa4662140b172474660e87b9b499bd/64281085501.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c624a214---xirabitadepirulate.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a77b965f907---90400809696.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/futalixeduzamul.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87f2074981---mexupuwugobuvon.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/larefevuriniveve.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160abccb4dd564---vexavuzozosiserenubu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/69tbv6cimbd5pjddmaeo9s2q04/vaxodejuze.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/rofevefuluxodegom.pdfIn PDF document text
    • https://chptravel.ir/data/file/sakenejazukotetel.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/janolazugepanatewofod.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a51f35b0d---34517818708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=causas+del+bogotazo+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_off0000c735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 19616 bytes
SHA-256: 7072315aaea6638d7e2e750cfb1a93501acfdbc8f31aa0bee2ff265082cfe8b2
font_02_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 10708 bytes
SHA-256: 348c317a857eba0a17d9a591b80a62f1350a304755c5b9f9705cbf66beffaf8a

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