Malicious PDF — malware analysis report

Static analysis result for SHA-256 9306a7937de46c82…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 16:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3326995d847f889cf79b12f3d4544573 SHA-1: b434ee1ec5080b5977663f4dfd8f6eb981d90887 SHA-256: 9306a7937de46c8290934c0eeb4423fa74e1428e31b5891dabdcef775a820e79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including one hosted on a compromised WordPress upload directory. The presence of a 'utm_term_redirector=True' flag suggests a phishing or scam-related lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://best-of-geldanlagen.de/userfiles/file/tewalavusafawidozaj.pdf In PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/48030953795.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/xeruluro.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/20578123029.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161350aae3527d---61695730633.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109012318328309.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210905030829.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/91528915639.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/tufejugo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161434f787c0aa---tavegosimuwurorutes.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/vezuromefefirogoxon.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/mupupabolobokig.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/vorumem.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/59810440867.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/33708038108.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f084b0fa1eaa586e682f1454be815f4c/mududes.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/12383957684.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/65418056359.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/95544129026.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/46782619335.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/xulinopidasunefog.pdfIn PDF document text
    • https://coluer.ir/documents/file/70071800964.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210910_4581B6A5CD97340B.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/wejari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+phone+connect+to+macbookPDF 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_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 10776 bytes
SHA-256: 09b08bbf7649957f4e2c051badff99d0bf9d07d0ab3784f4d080e64a52f9e3df
font_01_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 17684 bytes
SHA-256: a78484236e7743124193bf2cfebc0766bd7c73068dc7c6fca2dd90c759ca7ba2
font_02_sfnt_off00012e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1