Malicious PDF — malware analysis report

Static analysis result for SHA-256 34df199a139b4a50…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 01:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41acf11b9bed304cd383db8e62e4f871 SHA-1: 6e3ad908dc5fa0cc468b0217894904a9eb498f08 SHA-256: 34df199a139b4a504bcdfe891aab196728e41bda8c09ab2f42117a9ea7234ae6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as a phishing trojan. The file contains a large number of embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=computer+science+data+structures+and+algorithms+pdf PDF link annotation
    • http://liebherr-tr.com/userfiles/file/85359222.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607381e9a0840---fobogoxevibonurovofafij.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/07jgu9n4i3hcekf1moj3i2csa6/16866648177.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/99488345415.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/67o37hcm8c3hocpok49p6tt5ma/janenolalosevuwuzede.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fac68140949df1637ed01db2dae4da0c/36436056038.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/duxafupo.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/joxupejulowu.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/71246bbe5738673da0bc96279ad8aafc/998224095.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/pemefijuguturowinu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2977d7e10---puzimapaseme.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/1jpdsdhghud2s25hk8ic9r7171/18487051382.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/dilupolujegavuba.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/lozedimoviwekogubisu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/dokejipepi.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/q57rebukf0m2hdfg7lkd70lhcg/tawuzez.pdfIn PDF document text
    • http://ailizia.com/userfiles/nozab.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/paxute.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/kunixafis.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/vefetunarofixosid.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c355e0e81e---bixirulafuxulafagi.pdfIn PDF document text
    • http://eternaseguros.net/files/files/wewaxeniponanasafamesoso.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/48647866556.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/tifuja.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_off0000da32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 11200 bytes
SHA-256: 86b4236154637ffbb47a7a9a087102b947f16ef951cad44c20d946e8e186473d
font_01_sfnt_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 18356 bytes
SHA-256: 4662a85d317576a3d07733fda14a72c7de8aa775a708aca89a2ef25b57694fec
font_02_sfnt_off00012336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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