Malicious PDF — malware analysis report

Static analysis result for SHA-256 a990111e9b640d0b…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 17:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 686a57e2554613a8737ef6a30b32960e SHA-1: 98267258f48a5f21969a7cf6d2dcb0b467fd962f SHA-256: a990111e9b640d0b0c58374525a0c5192fc7e11eac16a58ec3a9dd13c56390c4
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/d67727mu3bd869iu8rnobihr32/sinopalalanotex.pdf In PDF document text
    • http://koppeika.ru/userfiles/file/75534222564.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/pemapimeragavim.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/kuwoduturitafelukamiko.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/75514713454.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/93041188107.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/mabatodifi.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/73162488046.pdfIn PDF document text
    • http://4yoga.by/pics/files/wanibibejifupe.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wabirezonibasuvives.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161351a7fcdc7d---sunadezux.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/nobajikek.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/xowukuxero.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613582bf3d39d---kepibajidumazuta.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/75944377332.pdfIn PDF document text
    • http://apothepharma.com/upload/files/pikidefutag.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/vevigalorepipofisupumaref.pdfIn PDF document text
    • https://buyafranchise.org/files/files/daterisoburerigexiwufetu.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/11565736065.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/78777137274.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/gisosa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eab5dd0435---botimuranudemadivo.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/kadipazexuxanuwizexow.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc07515fc---38017167307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+change+my+android+launcherPDF 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_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 10940 bytes
SHA-256: 1ae1fa324be2803dd1610eb42f9154c8f463b6f046108420d36f99ceef664202
font_01_sfnt_off000100be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 18444 bytes
SHA-256: 21920ebfecedeb0cc693c1cdd7f1c1f0d9ad97c6ac148889957fc533d8a9593f
font_02_sfnt_off00013001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.