Malicious PDF — malware analysis report

Static analysis result for SHA-256 493c7836ed1c21bf…

MALICIOUS

PDF

92.4 KB Created: 2021-07-19 18:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dd23ef52f5f295c7f1782c5f76f5b59e SHA-1: 8cbb9f28a4884a0881f7fb5918f5b537e55f3668 SHA-256: 493c7836ed1c21bf9609a200db949456849e6211db3090abc9e7bb2c4d43e553
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the structure and URL analysis point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/2f131510e11a0b5f752a7b4f271f55be/69820303712.pdf In PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/360bc34747b7d62fcb77fa469a6440fa/sarix.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/vasepozaxedudetuzugifewu.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/bizowevavakenowig.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba84a3719c5---sofet.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3473466e---40725343661.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607694f32b4c1---43198788991.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b873d3539d---42535299398.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9bf1ea22f7caf0efc3d500d2ebdd52c3/78601460320.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/rikenad.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/liwowozefoviwu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750682ad5e1---lukifefit.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/13247686078.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/tasirodulupinofopufe.pdfIn PDF document text
    • http://iltorg.ru/upload/file/bubapixetisubujaj.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/46824515993.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/barikide.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/91702406886.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f21b0dae7d9---tadivipuvubolosolifuxe.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ed8cc9cbd---34483220547.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210528045759_oy8d30.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606f86ce3778a---69931818915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=assassination+rogue+leveling+guidePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 17236 bytes
SHA-256: 70267ddb1b58bfa73ae19133d336c9a519d5a22562b2782bf4ca6ff26e011849
font_02_sfnt_off00014c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C24 10572 bytes
SHA-256: 91594094dc2f620b800442b0b5254badeb4efbfc5fcbeca8e5b9eea7241ebb71

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