Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cf0f492023a905…

MALICIOUS

PDF

102.1 KB Created: 2021-08-07 17:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ec4328b1f2f33ffaee608ac53430e96 SHA-1: e1ad83777d12fbc8fe9cf672dcb4bdff85c09e39 SHA-256: c1cf0f492023a905655d14d878ac0f4692940aee6a386c1169d84e7a371b38eb
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be social engineering via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://terezmisszio.eu/files/file/82520370764.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/dd345ad7b304ab8308deeca587071eea/27605538488.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/bilega.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/kosorovujegagivumokaworu.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/7c00eqkbrchhqn00e4te68io6r/kamulufanejonakimidi.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5f75dabe91aec07d88452dd4aa13e80e/62523242183.pdfIn PDF document text
    • https://mauspro.net/upload/files/binomiluxujoj.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7eed3b397---64505952750.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3d9b37976---61178613772.pdfIn PDF document text
    • http://effektfilm.de/files/file/panurolutimivubivagabekov.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/lopenesofax.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/31424367327.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/69820696632.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/tareriluwu.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/dabawemozet.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/sezogo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f37b390e8b3ce10d4875f682f83c6d8a/jobobuxolale.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/41811475139.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/242f566ddc77699072dfeed1adb4178b/71416585395.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/jijeridunogu.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/suzuzanudu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/56607ea36fab818f11e9a8e372d94bfe/35647597860.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/52244574808.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/jilukelemiluzifukoguve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hope+you+had+a+good+night+answerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D06 10916 bytes
SHA-256: 5bbf2011f565b48d8d609c1f44a5ad14513002322e3245c72d33356829ee5c46
font_02_sfnt_off0001460e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460E 17468 bytes
SHA-256: 73519f33ba9c166aa369807b1853e752697b584a5a22b2dc9e0c0c5a51984258
font_03_sfnt_off00015e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E20 16896 bytes
SHA-256: 310d3a167d49cd4eb23b3ca15558d8c6d9d21dadaf2852648c08b84adb764367

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