Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff6d7161fb2da75…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 11:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 694cab40cf37ab5412c6a08ad2dba874 SHA-1: 5a2c24dfa059c8f5f75c0f01deb29ebcf9585749 SHA-256: 4ff6d7161fb2da754e04949eac994e4ad0ecdc56f29ef541d40bc22a8ffbadc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://drafthe.ru/uplcv?utm_term=how+to+eject+otg+from+android PDF link annotation
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce345ae1fb---xujaxefevogifigitipuje.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16136659f56c88---xegifeloviko.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/32582515032.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/83787633944.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/todepi.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091415154273499.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6f7dd97b---88762270524.pdfIn PDF document text
    • https://tebra.si/userfiles/file/puvisixokafefunusuj.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdfd833832---29614057040.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/53626548271.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/dotukototexarurazep.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/67103503845.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/68606832079.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/74755871190.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/gifobimagisemi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da541a1d69---42099752623.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/feec6c8827066079f751e418220bc560/84099447270.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/balasenozinon.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/48859944979.pdfIn PDF document text
    • https://simorgh.it/uploads/file/99279388220.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xuziriwavowadame.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/54723114391.pdfIn PDF document text
    • http://winso.tw/userfiles/file/4838220549.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210914082421.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 17312 bytes
SHA-256: 02e7cab8706375d85f86a94322a75b613944035d42f64e5f36e1f3975fa7c833
font_02_sfnt_off00010bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 10812 bytes
SHA-256: 132156e6ebe48dbc86c7199d9b0c020005a336bb4469e482ff45d6029765d2d6
font_03_sfnt_off000124a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 2660 bytes
SHA-256: 0588d08630a051700f11095ee28527d2347c4ae8d87849bbc974fedd0bed88f4

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