Malicious PDF — malware analysis report

Static analysis result for SHA-256 473874a0642dcf24…

MALICIOUS

PDF

107.4 KB Created: 2021-09-05 02:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3e70852cb19f2e735bd5128c8ce2615 SHA-1: 817181b61d0001686ebdcacfe3bbffa0515e722d SHA-256: 473874a0642dcf24a858bcb62908810804e1ca362cb6b1c8028db201cf473708
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mmszke.hu/files/file/61899112799.pdf In PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae97d59de---molurifozuvi.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/dbbe95ea7241fd8f40790ae63cdfad8c/vugabajigirum.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7usmftmvi68scbnhige7udr0g1/fofozixemabezu.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/xobisukiporabezaxenogu.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/lazusumafege.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e30d85487a18f1a439c22f7d7234bfb1/rilavajuvubuk.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210827221652_t6dfb5.pdfIn PDF document text
    • http://stylekd.ru/files/84269134900.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/5e76679c5a3fbf6e8c694be26d04e3f5/dazowovumom.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c3b3088e---bujad.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608289fd9e0da---pexexukitugolinaken.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/37041538450.pdfIn PDF document text
    • http://martonelektro.hu/files/file/zowijezabadav.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40b6fb1a97---fasese.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/rhmikg640fbss623a9gklt93pg/farurulatelib.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161234e5143ea3---wuzewazu.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/nivuvajalikiwuzezumid.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/kivunugi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822f3f72310---tajusujuma.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c106ec79adb---towevaxuxasefanefejofulaf.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/75056585224.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/lipalekagikubuzoxobawuz.pdfIn PDF document text
    • http://coachhouse.info/assets/file/lotumixipovofamavitad.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/51608361543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=carrom+board+rules+in+malayalam+pdfPDF 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_off0001401c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401C 17544 bytes
SHA-256: 4da4e8d7b34bb9a0fd1fe423b0270546b69d914f402e5d22dce494639bf12122
font_01_sfnt_off00016db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DB7 10948 bytes
SHA-256: 6efe7a6a256b5c801ca98a4d3b329600bf8f2d91eb405593b36b6ad57afc55c4
font_02_sfnt_off000186d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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