Malicious PDF — malware analysis report

Static analysis result for SHA-256 d081086a4ee9925f…

MALICIOUS

PDF

73.8 KB Created: 2021-08-12 23:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9865bd149d67657534d44544825638ea SHA-1: 961f05d1c983cd07f385cb368497301b4582165e SHA-256: d081086a4ee9925fcf7aae501d6b2ac31ff4fd5168a92378c600f9feaac2ac8f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used to distribute malicious content or phish users. The presence of external URIs and link farms strongly suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef075472d---47302148484.pdf In PDF document text
    • http://asiavent.com/UserFiles/file///lisodeziv.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/rematozolonuvokejero.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f3b2b22e---18845167280.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/6882535413.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/xitasidat.pdfIn PDF document text
    • https://raljob.com/userfiles/file/60462034180.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b5897fc16---tawojiwemurakirikawisad.pdfIn PDF document text
    • http://capital96.com/userfiles/file/11776374413.pdfIn PDF document text
    • http://ha-sine.com/d/files/9567092786.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90b8c2f3bf---26067800766.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/u1k3693qp27jqt772bvfkfdtq1/bedinagilokasakure.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/36365182426.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/dufiwa.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160815989af70a---rudimo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d70d7d553d7---gokivegemakofuf.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29976c115a---50202715452.pdfIn PDF document text
    • https://scriptdd.com/_file/file/72931044088.pdfIn PDF document text
    • http://casaalu.com/luutru/files/bujetodol.pdfIn PDF document text
    • https://hirurgija.me//files/4937346282.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/jedisamub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=%C3%A7ap+biyoloji+fasik%C3%BClleri+10.s%C4%B1n%C4%B1f+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607911052b57e---7690179335.pdfIn PDF document text
    • 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_off0000b718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2A 18800 bytes
SHA-256: 8541b4b79c3e57f901fe0aaddb1c9307cb02133f02d9104baafebfd408bab299
font_02_sfnt_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 11452 bytes
SHA-256: 0a78693ee2d8d096623dce3d5a879a2147702ffc4cf738829cf3c29dd6f21e86

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