Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f99e1b24e0b8d1c…

MALICIOUS

PDF

157.7 KB Created: 2021-08-03 07:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5749d796415787a3e713d82928c18bcc SHA-1: d6da9271a695555804df692317d30db19ec48893 SHA-256: 7f99e1b24e0b8d1cce0b0d907366e0aae3f6ce88521f2a40701d57a056eef163
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable binary data, but the heuristics and URLs are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160befd5edfca2---rofibur.pdf In PDF document text
    • http://mnogonomerov.ru/uploads/file/wimegipunak.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a1c80b35d---jegepafejelafavatijik.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e82bd5a60dd4664f8e674b9dd9e780e1/lunopuzegadirejisuve.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836f07bb7ad---jaduvomefuto.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/vedobugezerumoduvuje.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3fb7b0b94---15079083187.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a66beb5efba1a5f5c2062626aaa184d5/davasitigeru.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/podcnugl5rc6geqvdh6u79ffa7/13644343045.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/wabarudepipitegopus.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6c73d7d4027777a69c569bab3ae3d88d/savovekaved.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a25adab7d2---nitizo.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/mazonofile.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacc7e5748e---rodewagasofasifosumabeno.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/21795839989.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210716_050845.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd033e5be---bubaj.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/f73dc668e88f9bb96d24ed46e4d42e7f/putanurexumenot.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rugejovuz.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/89983903380.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/011a5747b22eb1b7e14d158db9fe468b/ramunagonaxotobigadido.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160862ce52d8a1---wilefejawo.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/74705748313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+gems+in+pixel+petzPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D595 1756 bytes
SHA-256: 1d400f156900918ef2ca15afa88b34e2e81765d23d96dce16f87859720e238ca
font_01_sfnt_off0001ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDF4 19264 bytes
SHA-256: 0f8f42b73e0d26e9b22e72b4debf46a6d60062dc31d7b34367468e7f8feb9c67
font_02_sfnt_off000211a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x211A3 23028 bytes
SHA-256: 1a8a0cb58c3b6d763db5866d72b75f22796a7ebc088fa602cec38da32f017e82
font_03_sfnt_off00023791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00024fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24FA8 10572 bytes
SHA-256: c21a32019189d504856fc6c39b5ac16d5f44f3f7c4dabbcff12d21681e589361

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