Malicious PDF — malware analysis report

Static analysis result for SHA-256 46fcfcfac72c1ead…

MALICIOUS

PDF

76.0 KB Created: 2021-09-10 22:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 273ca695558b672bf9363dfd3230ca3e SHA-1: 1e8e23f49278d97b7d9bfb5b7b582a65a450ccbd SHA-256: 46fcfcfac72c1eadf923d564eb80cd1ff9ace865eef7f6d64b60c0c879de1590
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, points towards an attempt to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=auto+gangster+mod+apk PDF link annotation
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613022eca231b---10559741022.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/xufipavuripukufovej.pdfIn PDF document text
    • http://asqcert.net/files/files/jagefiriwubatorutoban.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/xolobevonusizigivimanazif.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/2965258543.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/pinukifofobudebej.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383299a3761---filuk.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/febexexiwot.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/seduvezu.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/jukif.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909222139285419.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/sanezovenejagukij.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/25722887143.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/gotutupokovodupuvudima.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/58301555128.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/rabexomenodogalazovova.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/16798127871.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/lanobuvawofimekop.pdfIn PDF document text
    • http://gr-chem.com/upload/files/97805718826.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/vawusetabasisilomawadak.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/68891090744.pdfIn PDF document text
    • http://minerva-collection.net/files/files/tikake.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/kebaxiw.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613668fe4c0e9---luresanek.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_off0000c614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 16876 bytes
SHA-256: 41b46493fea1841d97b7d1216c06623f3a0e760925ddb80f4a2ffaa50b66be97
font_02_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 10772 bytes
SHA-256: 40748d3e669460f4a298d71f0c968d8e4baa833579026b44bdae6923105490f9

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