Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abb3d4b9e3c41df…

MALICIOUS

PDF

103.3 KB Created: 2021-07-06 19:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 548d9169e25bd8932c3638a2b58acef5 SHA-1: f01445a6d064d1891015041a918e678807caaada SHA-256: 5abb3d4b9e3c41dff05fc41144acaebf85ec3d1cedf1473d5df94002d646837d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV both flagged this file as malicious, specifically as a phishing trojan. The presence of numerous links on disposable or compromised hosting suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://hasekei.jp/userfiles/file/78130505317.pdf In PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/iic47bbeo0gkkmng2kmplr3vp5/nunatibobeteravenevafite.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b805598ec1f---nolosanisevojivadafataw.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740992122e0---pubenin.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7828fdd8f31df50114ce42e0c7100605/lerinuxawojosadulopav.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1d41de22---fobesiga.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210524165424174.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/14850206846.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f6b2712d---94437966784.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081abfa53407---51851358.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/i9u90teuml6s827r97834u5u43/bafikuzaposanaxapuneg.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/8b73b6b7623f9a96f56b208e661fa0d2/weselefeje.pdfIn PDF document text
    • https://senhewood.com/d/files/95641424128.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/bolenew.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/3844393791.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d2086f146a5d8b657a2248d5208f47e5/raxen.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/jugitavuzor.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/cv2r2oqt8i7qp1ho644gct1q81/logumazepusi.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qdeo5srncvlo4cili9gof4r4o9/69920875478.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072108da85fa---56398770435.pdfIn PDF document text
    • https://andrejc.si/files/file/75181826726.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/xubexuxojidejidevarepeda.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608550a601483---nidujax.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/lajaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=00961+country+codePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 21832 bytes
SHA-256: 72c34e0e1cc46f42f98ac5cdae5a78a6358b14af3bc75a23465f428bf8fc489e
font_01_sfnt_off0001386f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386F 10520 bytes
SHA-256: fd87126b621419ea0b8d4d0f7a1d0407b12b76ff94383fecbc0b5827839a3067
font_02_sfnt_off00015079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15079 2732 bytes
SHA-256: 5e2ccbc570c8cd0c3060dae9fd79faf643d7330acc6cc015184852e4fec6b95e
font_03_sfnt_off00015c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2B 17504 bytes
SHA-256: 2e67367577e6e592ea9a81b26da1af8b5e363a603a09cd647eab119951d054fa
font_04_sfnt_off000176e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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