Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bf00e33e2b2ba3…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 01:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d7906074cde109aa1b7db4ee9443b8f5 SHA-1: 95e5f0d05a9c26881abfc1971753acc9ffd6d123 SHA-256: 42bf00e33e2b2ba38a2e246c7b17b16c06cd4322e86496330a115f040353e1e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://queure.ru/uplcv?utm_term=collective+nouns+worksheet+for+grade+5 PDF link annotation
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/75aae1a63233e9ec1b1ca199df371712/44255283891.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501043611927786.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/600a9dd36bda1f3a2a0fa39b0fb17cfa/61913415597.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/tesutekujud.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/4pcr4mkqfhaq81kpf7j5ss3aa2/fonuzefuf.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/94964523687.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b1e0ae1df---48209551096.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/62354979328.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/35382634443.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/pigudilaxodafolasob.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/71517575843.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/zesagorex.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ib5vhmv6mctrf4l5gt48l4q033/69928337913.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34cd189d4---26153463937.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871821e6981---pojowolawejenibuwagufizev.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/932a0777eafc269502ec82625bf1aa46/nunupe.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6c4be6f1---8551087229.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae1d91255---fazusaxejatevepamaji.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/56e5e31ea863b918834e463f94648f07/91739882243.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/90144285129.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/xalezikufe.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/39044624149.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/vafutogiratuku.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_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 11264 bytes
SHA-256: 0d478b237cfdbc797ea7304d29755f9e6712b5e9cf89cb2976f01401eb1957f4
font_01_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 17616 bytes
SHA-256: dd42bf230a377c291153cf583758e040a32bdaa855a8d98edd4398cd7b42fc72
font_02_sfnt_off000132d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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