Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3944b4ee4edc36…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 03:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a47d1f8c7b91849e21cde7105e5ac783 SHA-1: c6b5594a480ccaff01eced0c6723b04c148f1456 SHA-256: ec3944b4ee4edc369848ef688a4e132ed54dafca71ecb1879c005752dfe9cc97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous external URIs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary function of this PDF seems to be redirecting users through these links, likely to a phishing page or a site that hosts further malicious content. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=makalah+hipotalamus+pdf PDF link annotation
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430022132651553.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/vofogasoda.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/34046103912.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803ef1e28b0---gidaminagor.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/nolorinarovukusajojig.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/69b894d224373b5e70e000d5f99c777f/99321565611.pdfIn PDF document text
    • https://premium-house.uz/images/file/runusidebip.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/nowalafizusiwuwuxokupare.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/cob90talfihmlcl4ltujmrgop0/bokajulevukoxifovanawarob.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d15fc50e337a3e84ca98e107df2c693c/39317160728.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9316eea96---nidikiwi.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/51705305644.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/15801590769.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/patole.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e8c7d2d4a---wudilolatexefazodajavitir.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed0d30a6c---51060572232.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/tawaxojafesivijonefikam.pdfIn PDF document text
    • http://palami.by/images/file/23316855690.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/54309632906.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887ee6198c3---6888601995.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/57954142764.pdfIn PDF document text
    • http://4yoga.by/pics/files/16157410837.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/gufiponaxopexi.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed8c4998b8---xisoboji.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_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 10612 bytes
SHA-256: a791521bdfcee72fb56ee89671a95ade5b08698f88d59e3ca29ef007185f3570
font_02_sfnt_off000114d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D0 17872 bytes
SHA-256: 8c029211004c48c9d597f20d23dac67b42c3910afc269e0c531f3afbc3157f1b