Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6deb4700ecad37…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 20:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32f563e5633975350578cd1be33ac827 SHA-1: 2729faf001df0678c6ecd11d1360258cfaee1789 SHA-256: 0a6deb4700ecad377654712d85d7ba1ed5cfcb33d1628e1c812dd525ef8dd497
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various external sites, some of which are hosted on compromised WordPress installations or disposable domains. The presence of a 'download button' lure further supports a phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it is designed to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=the+conscience+of+a+conservative+pdf+download PDF link annotation
    • http://neogmbh.de/www/sites/default/files/userfiles/file/zadakot.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/60831505948.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/45352993505.pdfIn PDF document text
    • http://dentistturkey.com/image/files/53783244787.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/kidigutiwezelulis.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/47058248995.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/255d852d3bb6fe02c7b8e995321aa370/butulelav.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/peromujuwunulakijogowilak.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137951ea3dcb---vijusagedem.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/18532657684.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/71692680600.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161386b3082ec5---64159003755.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/13209896090.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/belususuriwitusawitipad.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/52259467595.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/31908210702.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/57903579746.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/zefofobovirigetiwewizigat.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/tudesigodigixiz.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/34213838377.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210902_42733D6F0BCC1C48.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/bomidaparezavaxin.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/dizebuleporuwagub.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_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 18788 bytes
SHA-256: 45053eaacf6110b32d45a0010a550590f6bfdf62a5c7bcbaeb1148ff23579106
font_02_sfnt_off000132ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EA 10832 bytes
SHA-256: 75e365ea8ded9eea15dfaccf30fd0781bf3f6e0b491ee0ecc6752f974f99c8cd

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