Malicious PDF — malware analysis report

Static analysis result for SHA-256 6246f5ec9b4bd47e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 16:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b2cdc0568104f68b072f4472104c991 SHA-1: 35283483e6f8c5dd872e0e2c835110ebb7f84e10 SHA-256: 6246f5ec9b4bd47ee4f247312d5c0379d475941fe3ad78a758f63d2f102463bc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://allytemp.ru/uplcv?utm_term=bg+remover+apk PDF link annotation
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/wapajuzutodesul.pdfIn PDF document text
    • https://subarini.ro/mm/file/16508683107.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109060035248045.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/lunobobavizirap.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3366114d239f090d28fcf17434ab9426/wufivilakap.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/94122570223.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/99388571606.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/kipegadivutusuzelemep.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/11437575345.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/84940904978.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/zetolekomuf.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/dasiwetim.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/jidar.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/wupixojerelogewiduvokije.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/furenazafivikameri.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b10499ff97987d986077f3452fda7ad4/943176808.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a6ca78d1394e6bfad2dcf93a9a1aa3b8/gutox.pdfIn PDF document text
    • https://ever-progress.com/upload/files/99996123397.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/43824515198.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/rowit.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/pevetobetovopemaxajimab.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/3383570573.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/58169673278.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419b97d0d85---nulelalodosajasuxize.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_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 18400 bytes
SHA-256: e8ff4346089a3cf171809c54cb40d86d57ede090522bcf5cf72e7073760ad95c
font_02_sfnt_off00011c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4C 10300 bytes
SHA-256: 512bd3ce277b871e78e583d2fa03f230377a35c9bbdcf86922b38773cff3b7ec

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