Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b8dea09d02a370…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 17:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3468341b7fa07c3853b6dacb6792ac8 SHA-1: fd07d1eec5a466a8e77e53d62190425f54585a2e SHA-256: 05b8dea09d02a37064f2937100aa402aedd15d1c0cad0c74f595837baf6ace7c
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The document body is unreadable, but the presence of numerous unknown URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7323

Heuristics 5

  • 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
  • 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://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45f1f39da---13623792324.pdf In PDF document text
    • http://alnadaoil.com/userfiles/file/lojewevuvenamenedugija.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/42495365198.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/vosarafopegapibuvemegote.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/87731965888.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/378d00338c4576f7044fb3c6a9a45d7e/vixijirokuxider.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/64d8b1ffe56a9a1780254f6e954f7e92/17511630719.pdfIn PDF document text
    • http://clarasonic.com/upload/file/fobonesinabuj.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608948ac9d8d2---notukoxazem.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/1hgsmngo9m2dbg31h06bbqv9ku/neniguwobi.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/45474273962.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/pupomegasorewogezeso.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/xaroz.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/72f63b6ad54cd509b3d65d3953891256/72381612904.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083947b80cb4---37576155178.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/94658041691.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbdcc5260---vagigagavegovokumomov.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/62912201710.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210510052313.pdfIn PDF document text
    • http://rapet.hu/files/74317125865.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863ef716113---7391070243.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/68041921032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=free+simple+english+story+pdfPDF link annotation
    • 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_off0000c31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31F 10876 bytes
SHA-256: 1cd5f15ddd339fb23769d2e6786da513aef8a93a6b9df274bc6931b9d5771a72
font_01_sfnt_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 17372 bytes
SHA-256: c4dacb38d2bdc4d1ffd45ab22028832ce3e75743c94d3f43c735ce10786a2eb2
font_02_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1