Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ecddbe7b696b55…

MALICIOUS

PDF

98.1 KB Created: 2021-07-26 13:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6b1a2332dcf6ec8b1f47e62a4476fa48 SHA-1: 8f8b07876d6d16aadb52b2419d80bd8b0a4d530d SHA-256: 76ecddbe7b696b5575343f900671a95d663034d3548d3ab01ef9c32d19a4c64b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9665

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://reversetheclocknow.com/ckfinder/userfiles/files/gagurep.pdf In PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/gtfmmpb2mrkotviabbc4fv84mf/ragunelakuwuxat.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a79452de---buvajovijuwenirokoluwesi.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/37188693271.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/fizaxejikumatewopemodenu.pdfIn PDF document text
    • http://gewald.ru/content/Files/rapodevirekevafugovonol.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/62656857536.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5c70d0366---72978852923.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/jbftge9qndouof0dj1o8u76mi4/resanabimuf.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/42889202278.pdfIn PDF document text
    • http://cichanski.com/Upload/file/72606671696.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/pn4ec0hsmb1bvj7h5j4o3c0ccg/85563188919.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c50dd3ef73ed752dee16b1161e1d19e7/fezuwovomipe.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/r96sn67ifdnb134jm88si5g9ib/wogafadewotisigulejofoba.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805bf540d10---27575047352.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/bojex.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16072f3d0926b8---kusakomovigebu.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7038b54e3---mazudewemijenetogiluba.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210515110955623.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/e6m3kvpm9pkki7r9aeb49inue5/zumodiretakibepunuxawibam.pdfIn PDF document text
    • http://teakdeck.pl/files/file/59823574338.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/45006513807.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/fogijurojuxuze.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/21706185394.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/54646446493.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/jexegovepanuwiveweviveroz.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1b716a7d3f89fdbaaf7cdd2d683112aa/tisugena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=toram+online+mod+apk+android+republicPDF 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_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 2176 bytes
SHA-256: d544568199d2af9c5c586f2640c9152f30f0fe25ec99c2c264f572c938b6f750
font_02_sfnt_off00011851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 10704 bytes
SHA-256: 42b12b301e8d0d323e9f84f029dffa447a8852da496cf0d5c1def658a069b293
font_04_sfnt_off00014896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14896 17812 bytes
SHA-256: 25b83177bddcc24d06775c3866261967feeb47a98d6632bcdb4babf62dd30ff3