Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7b04603fb1a186…

MALICIOUS

PDF

96.9 KB Created: 2021-07-03 13:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e8720e75183512ff4aa4dff44b3fd077 SHA-1: 76cab10da89487e55b840ef76c0c2928a9bc0df8 SHA-256: 9d7b04603fb1a1861ee8eb0903d581d9bf8a7b09dcccee1536becef135dafe60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6de36380---jeduvukosobo.pdf In PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/4cfef752f1fa119ff034ee9402521926/wabavavisorutizefetaxiguz.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/27e6417ed74dbbc405a96480613a2764/54383793880.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/183105fb15f0d14011767d0b51a64568/84239594985.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/6068136d4d3cf4b9c2fbd6c04580cbd9/31897828530.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/68190881d60419eb8cff1571171d292c/80094474251.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/39917069070.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4bbcc9a3---69924403826.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/nowopigezu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ek2o0ttht5b5tv1kqmrdu91g52/danawugez.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/22909624575.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94844b605a---54536933059.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/76028926264.pdfIn PDF document text
    • http://beiks.info/public/file/93243261477.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f463bdf36---27437783009.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/37512590469.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/cea398725e2a07f5301b552b7e6d46ea/90118762976.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/dopigefaf.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/7f2bac5f42a817bea265238c41eebb30/75747215122.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab23627ab34---63414202993.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844d5ed90e2---51139792542.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/46903861559.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/punudinofupuj.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/89385908804.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b35247451b2---jewarolejeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=if+in+the+middle+of+a+sentencePDF 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_off00011b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B00 10592 bytes
SHA-256: c1f6d54030235e904b98dfd64a65bbfa59f6317328ec525c7f9f3d4be7f3811a
font_01_sfnt_off000132f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 16732 bytes
SHA-256: fd9c90e9ea9f68f6029c784b07cab110ad5fe1b78c0ef9cda66bc6dd2e1465ae
font_02_sfnt_off00015e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1