Malicious PDF — malware analysis report

Static analysis result for SHA-256 308d97db943423f8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 22:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 77d3ee444d0185de489b373074f2c391 SHA-1: ec75c259634d1bf6cf4f3b7ee57e4e96e550828d SHA-256: 308d97db943423f8ea1ee08615240724e7ff4b1071bb22973c97e0c01e4c180a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to various domains, many of which are hosted on disposable or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on potentially untrusted domains suggests an attempt to obscure the true malicious destination or to host a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://naszemotyle.natura2000.pl/imgturysta/files/mabunizowuxat.pdf In PDF document text
    • http://darstin.com/userfiles/files/20260554930.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/tokiteremewupavajuragiz.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/2756136359.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/dirodajotusasemubojiketef.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/bumigumalavuvidurevenanan.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a4e5d205d---jifibudoxuzatepajuda.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/74756993394.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/jisovafiredulubokagifo.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/nusodonafaperok.pdfIn PDF document text
    • https://norservis.info/files/files/xuvedumipogovipoluku.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca1278ee0---39377819847.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/76783662353.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/3506178278.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a07b56f0adb45736e0f5a4e4e5c67d28/barep.pdfIn PDF document text
    • http://paliukenas.lt/i/File/kugevalag.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/75721546901.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/5131946320.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/56396958011.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/surawujiwixikuwixusa.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/fomunozuzobim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=touchpal+premium+mod+apkPDF 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_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 22080 bytes
SHA-256: 91416be02a48b885fa3155f98aba25ea475eebc1c7bd98b8813227ba7ae43101
font_01_sfnt_off00010a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 10564 bytes
SHA-256: 219f6f96bedc7856caf4bd9d4e85d2d474032221937427c029e6b04445582f00
font_02_sfnt_off0001225a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1