Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5d06f5c7c82742…

MALICIOUS

PDF

81.0 KB Created: 2021-07-02 04:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf9f559b9eb528c5c32b3621d54612e1 SHA-1: 6d2813b26116171a73cdbcfcac3ec3113d43188c SHA-256: 1b5d06f5c7c8274292783dd44c23b4af110a7650cdd89e938cbdd74f0f2a08c3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, hosting numerous PDF files on compromised WordPress sites. The embedded URLs suggest an attempt to lure users to download further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160861f8fdce8e---tisofegizuziwupos.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab9711cb56---14599144950.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/klkdig9ua0mtgnt1uk9opa5r76/96156656877.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/murupotuvini.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/vibumavudomimosil.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf35b452da7---webebuta.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/99a7c677b35bf94bb87931c9e07b9ad3/zibozokar.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608467cbbab46---50733631648.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/wodov.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf124690f51---42874766037.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/zozisanemevinopap.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607413309f95b---ramexulabuso.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/wolawibawavajovemekib.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a70a06928ed---pilekelubilupib.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c43186e931---98205686686.pdfIn PDF document text
    • https://le27.fr/docs/file/84572242169.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/xedadojegenosazitiku.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/53393129150.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/19086394943.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/kegukoximiziku.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/vj6unb587g9nfcj7u6b4cajq62/29957969996.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/xeforidemafilusesenajawa.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077523b841e0---jirebefitavipawutitogaxir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=concurrence+meaning+in+kannadaPDF 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_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 16664 bytes
SHA-256: e0b317fc290d10a372baaf2e92398a8cf9dd5777f432d0ae1343690794957fbf
font_01_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 10624 bytes
SHA-256: 356234c8abb223ac3b46b7850bc63a7751f2c0ccdc3aaba5fc524c6ab20f0675
font_02_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1