Malicious PDF — malware analysis report

Static analysis result for SHA-256 59db68f1c1cc8fdb…

MALICIOUS

PDF

73.1 KB Created: 2021-09-12 05:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a39444a6f0ee596b004114c87ac9ab8b SHA-1: 25b641ac351af5a41f963ed81f4bed73c9af1c2e SHA-256: 59db68f1c1cc8fdb21aa9ec71fcae1a58e271e95e2fe82ba3f635abd9e1b97e5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=home+alone+2+subtitles PDF link annotation
    • http://fred-robin.com/ckfinder/userfiles/files/57783204550.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/67988954348.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/38678729547.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/92571030103.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/645e8a5ef21f6357f58dc43f4e2083a2/48772429459.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/figamipomigabot.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/28840307370.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/giwiwenoxomivided.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17881537940.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/mesalagafi.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/92862269839.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/15142888039.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d397b238e4---wakogelob.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/bagoj.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/duxomegugagoji.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/nodugodal.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161305bdef02cf---39735890474.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/bolewu.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/44934753826.pdfIn PDF document text
    • http://cssh.es/img/file/86745571547.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/22574218402.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d10cb9dea099eb7ba3f48e091bf1387c/1926809402.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210910054853.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/nuwukevorusi.pdfIn PDF document text
    • https://rosycaffe.com/file/16311603297.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_off0000bd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD54 10520 bytes
SHA-256: c45ff79fe75fcabfbfaabec1756c1dd91863c138eeda377daae767f2fb4a3f5d
font_01_sfnt_off0000d543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD543 16300 bytes
SHA-256: 0eae9bd403d91da08ea6831e2b647519d0bf90caf447de4f438632a56f3ecc1e
font_02_sfnt_off0000fec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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