Malicious PDF — malware analysis report

Static analysis result for SHA-256 629d69af70837598…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 07:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f48209bbce02279134211a6efb923dc SHA-1: 483c24c2893931d1a381fe39e361b006f55770ae SHA-256: 629d69af70837598942a6aa5db4dad4808719bdd6fc968f3cd813c2b0b473be9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/0f133980d2c141a1b4f578c3e19c144e/vonijaxadenemuketeb.pdf In PDF document text
    • http://kokomo1986.com/clients/31029/File/nusovijoned.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9794d63d57eea631f94cf661fbce583f/7435991121.pdfIn PDF document text
    • https://olterus.info/contents//files/80002742535.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/42709009233.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/satubefizodom.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/disinufudug.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/dozorutonoku.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4451eb321---lavupiwudavubuvavidiberi.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210606_D848AC0F02DE102C.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/10324822011.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/21229578719.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc98603b4b---mojopopipukenis.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff8517ea2a---fabaxawoba.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/697775359.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9eef397d7e---48300553408.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5f6b45b0b1267af01efafed0f1fa755/ralagavuvidagosi.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/jurasuj.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/afe122af0b7ab9cd9e90ff52cbbf01fc/bupituzete.pdfIn PDF document text
    • https://cet.sk/res/file/78543807629.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b5a4324c5---wosexefogefanokodar.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/22969903951.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be7eb7be4bd---20821050907.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/wamiwebozamulegugi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd7f3033e7---37947188077.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/zuwafaxefedudilinolu.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/bogogugadopanis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=examples+of+reference+letter+for+expungementPDF 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_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 10916 bytes
SHA-256: f2b72799486c3ec288c787e3b42cc9555da240c49c48acb777c8cc0a93b84cf6
font_01_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 17036 bytes
SHA-256: cc2484ea2356e2ffc338a15b1ffc4b9db58319714d124ab69e42a370729fd097
font_02_sfnt_off00011f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1