Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f301d78fec97b1…

MALICIOUS

PDF

84.3 KB Created: 2021-09-10 05:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 086673a39c62ad3b0cf433abc26218ad SHA-1: 27264a700ca33a893c4f0922a6004b60d51a1cb7 SHA-256: 48f301d78fec97b102a7ee18765887038d3757e65306e07c16b2fc5e646da9ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://formpart.com/upload/ckfinder/files/29777231390.pdf In PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eefb91726---80523219490.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/bozuzifuj.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/pigurod.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/lujuvux.pdfIn PDF document text
    • http://mamadona.ru/ckfinder/userfiles/files/jofij.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210903045100062.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/30553157794.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/kokojunetamabedavuverir.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/35355277529.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/litosawe.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/6945135533.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/31533245702.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/femararogojalube.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210902132940.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/73415527604.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e73a117db---gewivabusisimuvagabevare.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/rusarugamunaxib.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff46b4b80e---teritixijoxilifuguzizogo.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/zaponosaniwezudigupofiv.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/bugubewegunode.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/92350215638.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b49867385---kutasev.pdfIn PDF document text
    • https://ptogel2.com/contents/files/vanubofulemerozolelowelal.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/ninemanekifekaru.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/26815877854.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/zakowalasazesonozulokidij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+transfer+contacts+and+photos+from+androidPDF 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_off0000e3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 10916 bytes
SHA-256: 2df712302d4140c36c5f32adb81b1d3960a9d2f98ab2f516a74eeb045bdce28e
font_02_sfnt_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 17616 bytes
SHA-256: ab5726f73880a7cc4c325681485af8d68672124b5e02c05ba424d2df57fb6a8a

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