Malicious PDF — malware analysis report

Static analysis result for SHA-256 789f31a3a1966d1f…

MALICIOUS

PDF

99.7 KB Created: 2021-07-31 23:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e20f068f7bc11b27e32fa5afcc71f4af SHA-1: ccb259fddd0ac300bf7b27765503baab41d24c01 SHA-256: 789f31a3a1966d1fb27f5e5e3158fed6a542e59a1f09232a3ecf3cd0d63226e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous compromised WordPress upload sites, likely for phishing or malware distribution. The presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://gfow.om/wp-content/plugins/super-forms/uploads/php/files/l3uosbi04u6128o004ko2rroln/likafetad.pdf In PDF document text
    • http://mmdplus.com/userfiles/files/20210623_152528.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ih36cgph9o8ur8vuhhsdbmch50/61037437463.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831c3a461d1---23258057760.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/93783673624.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f3324f48---bezujadoxa.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/getot.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/tebohhjd9ic3jcddeb2fu52ggd/gurivebajeruxibutid.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4db774426---72745847706.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/df1fd917a95241ad39923cc3fe6593a9/68343504885.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e69fb17455---lapokuxefeburesubug.pdfIn PDF document text
    • http://iworking.vn/uploads/files/lulenijifiw.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/9f9575e1f7ae08ac023b866b10e29a80/jegamemuvasisisaxiribab.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79a77cb5458e16ef9959c53d6ec2e3be/zanafapokaditanu.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/v9bholcjh1ac1uk0mhggj1qjl7/rexikoginewusuraparilun.pdfIn PDF document text
    • https://geniodelweb.com/file/ledapa.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607803022eb5a---sifufazani.pdfIn PDF document text
    • http://buckleyfamilyofdarling.net/clients/0/01/017bf228c8331327bdfb67b1798bff80/File/25066794739.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16091cd9a8ffb3---12343704129.pdfIn PDF document text
    • http://teplospectr.ru/images/files/72357907204.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6859acfbe4---kidubimafuligata.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ed0b88612d6bc892b1229b613f25f755/gumumivedi.pdfIn PDF document text
    • https://digireg.dk/upload/nizonuf.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc13b4dba---58783078460.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c64549123e1e9df5bcf98ad89619fc84/rejowolezekizika.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe257ae39c---7652861028.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/b4viop4o4n3b49sg206if564r2/62927628525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=windows+xp+sp3+phone+activation+generatorPDF 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_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 17588 bytes
SHA-256: 05572a41bed98035bac80c24a95afa0291e01cb33937a3a0179483394eeb1706
font_01_sfnt_off00014e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E01 11168 bytes
SHA-256: 1ce5de4bd4f644fac44fe9e3fe6880a3b27fc0bc7b8a735758c0d4d6b283d96c
font_02_sfnt_off000167f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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