Malicious PDF — malware analysis report

Static analysis result for SHA-256 815392e8af26bcd0…

MALICIOUS

PDF

95.4 KB Created: 2021-09-04 23:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b759482bcce4c1964412f8f84c3978c9 SHA-1: dbc2c703a8b83b551c697e7621d29c48deb3619f SHA-256: 815392e8af26bcd04220e5da036f73c99f162f845054e77c10d47067fcd8dbd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://chcial.ru/uplcv?utm_term=koalitionsvertrag+niedersachsen+2017+pdf PDF link annotation
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2e24b8721---foxabomimopix.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d49760ab08---noditulimesegiko.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/tubarodarurubudazam.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/b149668f321e6ca60ed616e35c621d5d/93771369449.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e66a119052---pevavirexove.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c39b493a101---musitagivo.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/vumirufeze.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/69024931006.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/wikepakowodugilev.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/vakiseleritevefuzajeteb.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2c6d315467d70765219c010b8e9933d5/zitevozidufuvefimevul.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/e84c724e577df841a2f5f5af6aff809f/62325873176.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c275394c489---ribojoxiwipapa.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/xewekes.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/73933242684.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/5113596217.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/26047321657.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/96cf07fb48dfc4678d728156c9c6c08c/botusekamejikesapaxeg.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/botedaroz.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/96546074872.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8d887faccdf3c378c3fda784c528a653/22844236102.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/dumebemopela.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/eecf60cb41c0e171307e5a466a86df71/70958728558.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/bisenijotoxakiwawagunufu.pdfIn PDF document text
    • 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_off00010352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 22008 bytes
SHA-256: a0e0ea4c35e8527a64d1bd711c7fb0f43b3bdca898f2ac96f5438ff61b185738
font_01_sfnt_off00013caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C6 11300 bytes
SHA-256: ec9a7b1e5d21aed68c44b7f960f076b00537ca46fa4570e6a491704bc1abe7d5

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