Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8683fd74c28707f…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 00:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: adf69694c32fcb79027ff8dd8bedc1bb SHA-1: c70a62d9da48d6f7f9f8c42019cbd1cdce486e19 SHA-256: e8683fd74c28707f612cf05509081852c878f75dab478f80642f631a585ebca6
124 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lure users to phishing sites or download further malware. The document body is unreadable, but the heuristics and URL analysis strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2573

Heuristics 5

  • 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
  • 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 http://re-media.ru/foto/ck/files/53134347592.pdf In PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/rozelosorizaxerekibe.pdfIn PDF document text
    • https://artenika.pl/fck/file/12718655056.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/52250736554.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/maxarumadutosujob.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/92350249309.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109070156596372.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/senemijonopadewi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f024bac191bbee71ec9a7ce9717137c3/23396345712.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/gakowudabuzezop.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/fafaza.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/zakuvugudifusolakupopur.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630572747.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/joxas.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/duvilazugud.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/ravidaseduj.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/16833584938.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/86151664758.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613333b61ab23---24698727634.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161347033cffad---rasakajabebed.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2d3c3d6c5ab00fd67fde1ef56f2a9cf1/66985961305.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/88567771033.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/donavebikunexonunijiw.pdfIn PDF document text
    • http://matras-devison.com/upload/file/33779449566.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/banubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=friv+parkour+gamesPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210902/16305487566854.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD193 17160 bytes
SHA-256: 4db4af0eeae4ef7c1f5f6a8161f9e377adc930560a492f7cf64871ac09884ef8
font_01_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 10580 bytes
SHA-256: 52f735bc6137830ed10f2819a9d31091d08365623b71124d5977690329ef48c7