Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfb3c74cbc85536…

MALICIOUS

PDF

91.7 KB Created: 2021-07-13 16:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc074372d920e1bff792b7e1df79936f SHA-1: 37601a0506e358b05b5a17752c0434fcbf05b8ca SHA-256: ecfb3c74cbc85536ad6142da87ccdb69f44a19d2d28d2aac403114ec26b576a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3aa24rofsgr96qaos8uc9dc3k0/vuderixivug.pdf
    • https://sasalidayanisma.org/uploads/file/femikamolamamezurifof.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/61629524454.pdf
    • http://absolutelyneon.com/userfiles/file/xopazonuludapiwumiso.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/10864596470.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/dl4qhpksppho7ndq7ed11907de/rudimimojaju.pdf
    • http://haenuri.net/ckupload/files/8714678008.pdf
    • https://aluminiosarla.com/userfiles_arla/files/82399264649.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aea8ebc87---12306875930.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/k8dp8frj9hqv4gj2oe7e5e0s76/tedonanufuletanesanekav.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846d803750f---muxolomerozobigemi.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a072bb4c7f4---41988388055.pdf
    • https://die-elke.de/cms/elke_page_files/file/regigifugajigomabeni.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b2f16dbf5---jexewojiravizenome.pdf
    • http://abw10thstreetne.com/uploads/files/kegezodokavexi.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8032e2e798---duteronakisabiliro.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0087c5fd8---sexave.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/67910630713.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/mamavuratafijimefujizomed.pdf
    • http://akkoryazilim.com/userfiles/file/furelenipobere.pdf
    • http://canadanur.com/resimler/files/pevemu.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a96db491679---borotamalajipifaxunow.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4cd01d60e---ludodugojilironipasudafib.pdf
    • https://fokusmedia.com/images/uploads/jikofisor.pdf
    • https://anmoul.com/userfiles/file/tixulobugivefa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=german+with+jenny+a1+exercises+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001019d.bin
df7c3a6484e74d65a23f561e78886ae9f9a9a98fe32a980b7bae00ca75db1e38
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 11240 bytes
font_01_sfnt_off00011be0.bin
5746afa3f76de01543f7c2d784456fe18f9870e42d552a9e1798444bc130a010
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE0 17832 bytes
font_02_sfnt_off00014959.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14959 16792 bytes