Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fea632d1b5f7b0…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 06:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50d7957a1d92a79b27b5feb786e95d21 SHA-1: 9db11b58a79951c515aed0cdc734727a553e848c SHA-256: 91fea632d1b5f7b0553613db93cf4dff8779fcf994a573d39497e9c91175ea76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious or compromised sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e4e38319---gozonubipajixipesamobuvi.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4d4eb918ec8aff09fff9878af9abca1e/51593641412.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160daf3e687975---bozizeremoje.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ql7h1dvevu1ign521i8mp6dn52/26954992095.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/15063079526.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/svbvleouu08d7f81pl2v2it74d/joviberifivaleviluzo.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/0ddccd832f054fe0578e6d0f1c2c7348/55201989955.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/fewokanutozikimabitulo.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b5e00d82ecaa3168eb28dbfbb5f3abcf/11335604030.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/15635100864.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/deduluputusolovijor.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/76233671309.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b00529162d2---91849389907.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/1942198536128c82e66084.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ca495e8aa---80193940103.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/tixorupudusuje.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef2085c06e---nubewizevaxaduvawifuvob.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/vojagarosef.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/nusokijinane.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/8e6bb2310ef67fd852dab9a4cc7be84a/timokeribokutu.pdfIn PDF document text
    • http://dakmet.pl/upload/76933545450.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/20372985836.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/7804523916.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a1798bd9fd3---padivusejuduboxalilux.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/10cd61d7be5e2112a6b4504fd2fad3f0/fazoripisufuk.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/foxepapozabubis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=adding+fractions+with+unlike+denominators+worksheets+grade+6PDF 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_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 17416 bytes
SHA-256: 38b750063539528614bc8be326c420d6bb13ced9ebc82d1a16d5b91f30c71b87
font_02_sfnt_off0001185a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 1932 bytes
SHA-256: 6ec716fe2fd522b14fb10223900cab397d85e9b8ecb5556447bd46ae208e1d81
font_03_sfnt_off0001215b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215B 11352 bytes
SHA-256: b71ac3816b661e0df2f0af506041586ccbef4a7003d9ea2824b9dd27cc792898