Malicious PDF — malware analysis report

Static analysis result for SHA-256 6123e97d1badf654…

MALICIOUS

PDF

75.7 KB Created: 2021-09-19 15:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7cff318153971a355d9a8db27405033b SHA-1: 1403b58f02f166379547911433cf9bf1f721c8f6 SHA-256: 6123e97d1badf654941b95326784253212dba60b723985a96961a4708c9a85ae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various compromised websites, suggesting a phishing or credential harvesting attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm its malicious nature, likely as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=unlock+pdf+password PDF link annotation
    • https://rmp-familienanzeigen.de/cms/files/92905291488.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/60926669913.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/6386604190.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/95915693756.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/56344900113.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/71285913647.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/698ff68724f07d78253ccdecd6f2be06/jajixajoluzigorafizudamap.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/46251464062.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/32372844044.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/59641223766.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447d15c7c49---79506241320.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/32621516194.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/ronunesaxixobaxogubunuf.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/91320034895.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f111d88b60---wejalafolana.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/meputerat.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/22908360465.pdfIn PDF document text
    • http://93564497.com/userfiles/21523087722.pdfIn PDF document text
    • http://strap.sk/uploads/file/87823501638.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/modaxixe.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210918081644.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/98007696706.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210914_090506.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/pawemexegubasetelojofu.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_off0000c200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC200 10476 bytes
SHA-256: 64b3b113f3005f8aa5dd2c420e9214bd27a1e1b5610e8d70976597335480fba8
font_01_sfnt_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 18212 bytes
SHA-256: 66d9d65b41735291104b6c8f28535152235144c4db1597f40e0e622d5db3c6f9

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