Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c254c270f5602a…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 09:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a3a95c34b2649ec2c4b568ebfb88478 SHA-1: 5551cee1f7d771b5d0e04a2f7c221f438ff78b4f SHA-256: f6c254c270f5602a353d56e09749e91e6421bf2bec0e0eba22a3ed834b273867
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress installations or disposable domains, indicating a likely attempt to distribute phishing content or malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://thy-environment.com/userfiles/files/13282972809.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/67c18951c55307e37db6e37d5d507633/ridava.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612576906edd3---12988240459.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/popamitizijomo.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/sazemaze.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/xasubezoroxuxeguru.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/3678620ea5c6208d88bca217d6035b53/49704098705.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/pafizabo.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/ririmividevilepabotu.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d64fc7f795a80c5a31bc8f8ce07af8f9/4557147852.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7ab0d275---sagopojepefo.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b611321abf9---76823644252.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/rupopedexowejuwa.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752c9c1354d---woxapomat.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607945ef58ece---sewifepegibul.pdfIn PDF document text
    • http://mutitar.com/user_img/files/javagoladulodab.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/dawafazuligideruv.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe27b994d---raxoguliduvutibalamosewaw.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/62525909416.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/dunaxumavibebiw.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/13098486940.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad963a6e6b1---tabir.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/rafunajurifutujofiwif.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/riluritobakataxu.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/25tavlkjklloh4n7vjrs8gu18b/didumugilowoxeramowimori.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/nidapowudevaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=use+of+besidesPDF 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_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 19664 bytes
SHA-256: e303b8fe6aeafa09e317973649f5df4bff1f930700b1629b16f3f59b53838de7
font_02_sfnt_off00013724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13724 9984 bytes
SHA-256: 15644a57afd1b9f7d1e9d48745a66cd1e20942cfd470e1c689a3c8895c878927