Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa3129bed22bd24…

MALICIOUS

PDF

68.4 KB Created: 2021-09-16 14:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2590cc6131ed82f5ad42c3d4b65befa2 SHA-1: 5d6bfb83d9edaa77e7ebda08c0fb4654a7da6714 SHA-256: 0aa3129bed22bd248a2467ef2b9abc1fd966a7a29363b97a68453f2eb1f01635
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest the document's purpose is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://flapboxes.com/userfiles/files/94454033291.pdf In PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/92ca1c0a8e7c18425702f44c97b81e18/vodamolabu.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/26459310134.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/92518694216.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/16577626655.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/47648668257.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/77213845661.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109141109471923.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9a883d5ea95f1d8bf31e8923746a2296/79836213410.pdfIn PDF document text
    • http://wwsm-us.com/files/file/90609088047.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/valifapolotugepupajov.pdfIn PDF document text
    • http://axwelindia.com/uploads/59486974296.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/6675906039.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/15063147530.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613701221a915---wufupapibesogo.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/bezidiwub.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/ritepowugaw.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae75311241---20658646663.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a6ca78d1394e6bfad2dcf93a9a1aa3b8/gutox.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/86360267259.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/dovabevazitezogil.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/23037056760.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/36992528721.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/63115789939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=playerpro+android+apkPDF 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_off0000af6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6A 10328 bytes
SHA-256: a0bf545922b8452191d031277ed422026e119619da712205f925ddc2d8db25bf
font_01_sfnt_off0000c6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BC 14840 bytes
SHA-256: 1902664ef5c9cc2da153d3b49449205c723aacfb2c9ff394ec98611bc6cee3ff
font_02_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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