Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3fa0e707f32e7d…

MALICIOUS

PDF

88.4 KB Created: 2021-09-07 17:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7928ad9d973e1bc2817065d9e886052f SHA-1: ad5da52bffd47bfc98eb6d39b1e2c406e067b8aa SHA-256: 7d3fa0e707f32e7dbca36fe965cf0b72f142e0f53e69354aa44cb4123c40cd41
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through numerous redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://timeyear-v.com/userfiles/file/gatimi.pdf In PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/dipusa.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608786fe8774a---92139904762.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/94511862684.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082dd76b609e---xavutimuxexemal.pdfIn PDF document text
    • http://splogservice.ru/content/file/ruwenutusomasurag.pdfIn PDF document text
    • http://billsky.ee/files/file/guburiwugakodedojiwox.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/1309889449.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5d42e91cf---13150652484.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/dd477b71244683cb0403f74e1c682912/8949845484.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ddfe60cff---82586606104.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/8419541974.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/17193095451.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/zelozupude.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608629fb65c4b---sebuvitakadebeni.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210529023157.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/02a7d8bf4b5d938301f69d71baada769/masuxoniduki.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/sokabujezojus.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/zogigor.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/49496211561.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/duxigul.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a8244158fe3---87549888927.pdfIn PDF document text
    • http://findusafranchise.com/files/files/94400582397.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/wekotirenezukitunazak.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92c1248dc6---54772386051.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70539775398.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/56963843936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=esl+phrasal+verbs+exercises+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_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 18464 bytes
SHA-256: 1fb57873431c243faa857a2257a8abd7bb9b1b0801c9eab56a10a45c29fcc8b2
font_02_sfnt_off00013b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B87 10684 bytes
SHA-256: ada506ae1587781024760d1a2df8d7677f58ca604a9813e68d14a1de8f63b80b