Malicious PDF — malware analysis report

Static analysis result for SHA-256 9348dc6afe766f49…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 11:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 670ac22c772f5b6a38b5ca0f8c508806 SHA-1: 534731c49b2d666b07a1fb01bc8876875467fa5c SHA-256: 9348dc6afe766f49e48207249bdbe962167522e42715506d6430769943680e34
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis revealed it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links are likely used to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1a0a356123bec3e34212142cb855882f/12264122454.pdf In PDF document text
    • https://caror.hu/ckfinder/userfiles/files/51902658369.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/duwazalupoxu.pdfIn PDF document text
    • http://minipit.com/data/files/84735456625.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d114480f5d---regamudugugibuvet.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/46625679792.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/woburogikiwiliru.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/2f2aa2f334de8faf749e29861a2a9d33/teterofixoxob.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2f32e7a287596b3e3b09cc08b2bf8a58/42209651493.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e175eb54bf---zafimexabajumatokosiz.pdfIn PDF document text
    • http://uclerbaklava.com/resources/file/28791524316.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f6c91fe68---bagowibikafi.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077750ecd95e---1202336040.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/bilasanometopifowagam.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/91be2567577d3f0bde8276a917cbdf3a/7816741353.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/042727d53054a3321a367b8ede9165ac/47185854949.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/xevusawojazokigarokuvime.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700e3ab0e8a---wexofowodimowegiziki.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16076b733b7279---xajew.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cd0d07b68c35984c701494b1fc955d38/xituwudumosirimuv.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/4522825417.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10baa4ca65---kikevuvoxotajamob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=good+songs+to+sing+for+talent+showPDF 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_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 17680 bytes
SHA-256: d63246127cf26a30f6b75c338d63bc955e7fbf098e6cc79f571137796ea9655e
font_01_sfnt_off00011009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12820 10756 bytes
SHA-256: 96f308c1d563fb1863325701a8c7779ab5470eba3089c37b245419c3e1cac316