Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f2ab98bd9dd1aa…

MALICIOUS

PDF

78.4 KB Created: 2021-09-03 03:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c44b0c67da6654267c354bf8d30e744c SHA-1: 0397b0ecf133781cb78bf8fb3120336f44e9055b SHA-256: b6f2ab98bd9dd1aa517f2822f11853bcd3dadd1cc461f4c89bdc4897b786e686
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS uploads or disposable domains, under the guise of a file conversion tool. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://sunnysidehighschoolclassof59.com/clients/867562/File/tosemewujujagir.pdf In PDF document text
    • https://baobihungphu.com/media/ftp/file/wanizeji.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/81285854760.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/3761809671.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/vafunoxokufunive.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6dmegvbg2orll2jf2htlcqit8r/4378132173.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/xixanoniwosez.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ca409239---wusubuzuwotavopuwimu.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/tamupafomagegoburubude.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/larunixetavupubuwivaxaji.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/safogimap.pdfIn PDF document text
    • http://abc-tel.ru/data/File/linulukepadonewanidun.pdfIn PDF document text
    • https://masukpt2.com/contents//files/nemosajojurotifuse.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/kewuk.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/46927926055.pdfIn PDF document text
    • http://nktrading.qa/file/files/1188791583.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4a4eb46d6f046ac70b39d17280a99d1c/kixasibuvorovud.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ae67ca5c44976a08a3906dac087a002c/fofuvatetezivinivogoju.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b8f4d0a3---tuketezifop.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/44192506807.pdfIn PDF document text
    • http://brukbet.com/user_images/file/wazezinefomivo.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/sojukal.pdfIn PDF document text
    • http://belovosushi.ru/files/guriluwakegitawajatunokiv.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/jufvf8mf4crej5tnc2nurqkrtq/xokugomajuronexuz.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/vonipon.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/vumifefolewigurupevutike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=convert+word+to+pdf+app+for+pcPDF 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_off0000ce67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 17248 bytes
SHA-256: 64a4dbbd7142ba67209a64dfab733b3a26908b78b63effbf2473833414d681e0
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 10488 bytes
SHA-256: 78ac15a4ecb5f53f72f4ef3dc303eb8462febc66b9976b6093f16bab2e0859af
font_02_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1