Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70364913f491a6b…

MALICIOUS

PDF

90.7 KB Created: 2021-07-05 02:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: eb7049fa657a325a567b00dc7fc6375f SHA-1: 190af00305766f868feaf3ac27d4b31c10ded7bf SHA-256: d70364913f491a6bb801d22e02efbafcaf4699139c95ce83e3c8f8211f3dfb19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, which are likely used to host phishing pages or distribute further malware. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://laborke.ru/uplcv?utm_term=meaning+of+subset+in+maths PDF link annotation
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609faa71a7a06---55954251069.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160849f0ab3d6d---12702013598.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qmecolmbds3reru80k760gomqb/94847747856.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/75998203613.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607784e725aed---deribokunorobatugekokabi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed2a08f152---71831426467.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/40851924890.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/50644170201621979878.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/48682985626.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607465bf76dc8---5277233113.pdfIn PDF document text
    • https://soechi.id/userfiles/file/buzowozenitoguvobaki.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c63857dd---tadaridosizabavobisubikub.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/gawibotipajojemabagegoji.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160927fce32dd6---64672122616.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/sadaxufoxetejagibabaf.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10610d72f2779f75f38f84e5ea6702aa/dapogefizoberefor.pdfIn PDF document text
    • https://vestol.bg/files/file/tijejatudotujonenapenis.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7be64ec714---65177035089.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/9dcbbh66v6q8ka2lt5cqss55h2/bivikofi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608689f4811d1---69882818796.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608acafd3e91d---meburusavoxaxotox.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b063444b1---91855907011.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/suwitujamozujosem.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 10748 bytes
SHA-256: c91bd067f23488f5dbfa5148280f3b78c728ecf424107ef3cf2234317b2f0d4c
font_01_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
font_02_sfnt_off00011214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11214 19128 bytes
SHA-256: e93c230f81906c65863f7a446294fb7ccdf3f296c5370db2fb92f31a96220b39
font_03_sfnt_off00014530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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