Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed4e53e8e76ff41…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 01:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c0cf543601c689b35714420e7f32d25 SHA-1: 88b92ec7ce7164766bb55a329cc2bc892cf60717 SHA-256: fed4e53e8e76ff41f089fff5bb48df990535ac79815028db9e17822f0e11d867
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm, with several URLs pointing to compromised websites or disposable hosting, likely serving as a lure for users seeking popular software like PUBG Mobile. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://korovin.org/site/img_ufiles/livapadojorexisavetefa.pdf In PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/8177b7ee18a14ac58d71396ac8f289fc/43725914787.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/jepijimezupuxug.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210909035550.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/tejev.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/8349901776.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/58182809157.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qg70dnln80f0r1j15eapemrsp2/koguxekimozukopanit.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/wixemegunosuwotodebuteno.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135712c70acd---92863461660.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/48125706068.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/rinodosizazajoz.pdfIn PDF document text
    • https://signika.pl/Upload/file/wovifig.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/vegak.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/46920596561.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/gojenipajepakugub.pdfIn PDF document text
    • https://riwg.in/userfiles/file/kawogiradapinapobip.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/7803170892.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133d192a77c2---4862496596.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/40389429970.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/63468686270.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/22218793043.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/sidadajozazutupewimumud.pdfIn PDF document text
    • http://brenderup.ro/mm/file/55519077801.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/lupepujevovawibegalib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pubg+mobile+apk+download+livik+mapPDF 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_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 21544 bytes
SHA-256: 4a36b227ea4f5e50624ccac721d82eb247ad96e788a8585e7aa17d6714581c85
font_01_sfnt_off00010eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 10856 bytes
SHA-256: 6f8afe4f5bd46ad384ec5ef2280f97f9189be3fafb3259a58464623cebfa151f
font_02_sfnt_off00012747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1