Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89027ceda6923a9…

MALICIOUS

PDF

83.8 KB Created: 2021-09-11 08:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 458bc3b980e32d84eeec0f9ea99607ed SHA-1: 89a786e703001dde3f8e32278e012fc96eb59ee7 SHA-256: b89027ceda6923a944e3d336adb974b61987c3edd860a72602d8681ac23f2d2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. The embedded URLs suggest an attempt to drive traffic to these sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://carsen.sk/editor_uploads/system/files/60309783591.pdf In PDF document text
    • http://poorclarescork.ie/images/28427736735.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/luvopib.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/lorim.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109010808349729.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138487b967f7---demejuxoxeluvegugakap.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210908174425121.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/lidegepe.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/masedigidavitukab.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/xulirapavi.pdfIn PDF document text
    • http://mp-journal.com/media/file/1980045570.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/tetumimupe.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210909060339.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/29731849562.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365f2070791---xavulatuzavapixut.pdfIn PDF document text
    • https://adium.ru/userfiles/file/gunixesonuvafitugadagiwa.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/14252647282.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/43365621697.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/63490163549.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161345be67d407---pujeduk.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/rujajadole.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/74843849892.pdfIn PDF document text
    • http://dogable.de/userfiles/file/zekagotesekom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gaming+phone+price+in+bangladeshPDF link annotation
    • 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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 11044 bytes
SHA-256: 8f3055c32c8b10ae7f4c17b66469d984c20ae1b0a1d1bf4adbe5abed44b1372b
font_01_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 18620 bytes
SHA-256: 46039ce07f5be3548cfcd419cea84958fbec27c21d19ea3c42b2ae50114a8324