Malicious PDF — malware analysis report

Static analysis result for SHA-256 911d5bbcb0d18aa3…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 12:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70d6e861f8b7c58ef91f1109eb36b05f SHA-1: 9f6ac41ead62a5c45ca580ef6b1bedaa37991522 SHA-256: 911d5bbcb0d18aa3b9016ad1a30aff446f5ee6338eef72b64cd334b608c6a4a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The primary attack pattern involves luring users through a malicious attachment to access further compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://neteyes.eu/editor_up/1265747027.pdf In PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/zirulijekubosiduxeg.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/wunabalarudubitunoxuxap.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-12/images/files/15248967154.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109041528156763.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/27759774432.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613215f5be4fd---89341246342.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/besovese.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/60912973616.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/dokakekiwi.pdfIn PDF document text
    • http://candientushinko.com/images/file/9387504183.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/nixemesemuxovuvexukaxir.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/26853546804.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/tibofibalegibaxuwasufosi.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/90274489959.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/54167794902.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/lewesufutesusikub.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/cf8cbaaacfe06a9aff48772ade55119c/gisalalijixofaf.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/kidirabuwa.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea3709244---4807084291.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/lopojo.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/30241462211.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141532110cdc---fedipuxak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cool+house+plans+minecraftPDF 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_off0000cc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 10876 bytes
SHA-256: 72ff7cbbec96b0a549dd815969c688132f439c1473578e2f7b62a5c654ec29b9
font_02_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 17028 bytes
SHA-256: c50cf80ac609c04818d50618d44dda2c9ef43834e3f5a09f5b58dad866bce26a

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