Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7785379850d9281…

MALICIOUS

PDF

115.6 KB Created: 2021-08-09 16:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5277a1bcae6740e74fada1e04bf26b6c SHA-1: 4f16d6b077dd556f1593da019ba16bfe28e8e2fa SHA-256: b7785379850d9281b82347f0c0a2c73b78f379cadd040441c001e832230dc675
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were directly extracted, the nature of the URLs and the heuristic firings suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cd5eeb3ef---zupixodipedonugonajut.pdf In PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860a6c2893d---powegewopapux.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/tewetezimemoriwatekanureg.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/karadelezo.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/2456794526.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a1ef79352---29377857006.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/dafitobalu.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073cbe244013---18132727143.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/nebotutorenuna.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/84295099999.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607917d7110d0---vokezofenozilona.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/m27ujrh9nni7s0leng7srhufc5/54004163649.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/xogeruzepekunoneri.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/podudibotumifufidodopino.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/70672056568.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/49704559747.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf87c83ac67---68799760208.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210528_4D9264AED6B673DF.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/qh4j2s5136am0hr98jmur7bfb6/xilekugujutonesigilebi.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/midazona.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1170a1d4978c3e82301c0a8d35fa2cab/jokimokoxerovux.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983603baa03---16308545284.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6f1bc3e178---sebir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=libro+primeros+escritos+de+elena+de+whitePDF 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_off00015ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000172d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172D8 19524 bytes
SHA-256: 73774930d28d94eba4de17a0cc54345c373a78d09bde4b41bcbca710c4fa8a9f
font_02_sfnt_off0001a537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A537 10960 bytes
SHA-256: 406c7d7ba05e232ea94d6aa38044775094a846456deba650861823077363383e