Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e6b523fb883c8a…

MALICIOUS

PDF

93.8 KB Created: 2021-09-02 09:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 623d65b76e863872568f7617cfe43d5b SHA-1: 2b7eadb9582e4790836b96da11d06170031b0931 SHA-256: 42e6b523fb883c8a65ded8ca143285f71bc5444372be57bb1ab7358fcdb7c878
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This pattern suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to delivering a malicious payload via the embedded links.

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 http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa72ac8fe---tewava.pdf In PDF document text
    • http://anvlaw.com/userfiles/file/69633517469.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/m6c87d4httce7doj5varl5jds4/11956082678.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/jivuzorafurubewak.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/detisaxitikowagunexavigal.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607400654cf81---46960518080.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/zugoburiberojubujefofabi.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/90e8150a10fc5a558b2df8095584d400/74780988272.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/d89b76361e900ec9c9d7a8745c060c43/dokamazepomopuwumagej.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/11910212453.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/tupojobijekifiruzes.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608850d67b0b7---74023320206.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/46290423433.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4b0899d873607aca96fd671d7550e416/zoreted.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16101287cbf374---marigegewa.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/iv5m3nfs0n0eq0v3a10i6qumnq/99921982241.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/94083542833.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/depoxep.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/devikegebedigatawezig.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xoguguluxulajagodisotoje.pdfIn PDF document text
    • http://chayka-svg.ru/files/tabaxaziwokofenakanalu.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/xeruvaxijiwi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161071a7cc6f32---joroniwadikapexedikajezut.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/wusonuvemujewagivexi.pdfIn PDF document text
    • http://labsshop.com/d/files/96267371585.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/39263388095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+gifted+cancelledPDF 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_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001234b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 18032 bytes
SHA-256: 304425afbe813480add5625126ed41de7b8e9ace8702f395e2ee1248e0d4b19c
font_02_sfnt_off000151f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F3 10332 bytes
SHA-256: 43fdca39b6fc027e14a7dde566a3abbf24af932d0b69425289ce71bf7be6cc62