Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae55856ae0c1b0c…

MALICIOUS

PDF

86.5 KB Created: 2021-08-16 09:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 79fce7c6fa102b865b25ab6cfec04af2 SHA-1: 5b028fb3b20796463a229a41c44cdabeacda583e SHA-256: 3ae55856ae0c1b0cfecbd64ae78fa3d04f83d1cb40b6f9e64de9ff933196e3db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to other PDF files hosted on potentially compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://rent-1.es/ckfinder/userfiles/files/vapanobitig.pdf In PDF document text
    • http://skiflogistics.ru/userfiles/file/69345882663.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b69fee703dd---wazasofetaro.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/28588948814.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/sojezesojoxunazerefesux.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e13df454790---tifusiwobum.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/revixemolajariroponifemin.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c621bc3f98679b0361670ad18a11021c/70286794854.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b300d493632---84070539146.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/0h2n5bipmmsgaq3fe3fsl81097/jazibofonenekivekuwis.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/46664969560.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc841bcd9---weliramiromafivedoj.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751106b3d7a---sufuwuvamurobepolubabem.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1610c95f6e181a---33942510131.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bai5ersk6fqioa7caiiboc2ic5/ziravolupisese.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/biwibesabugofavufagona.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4025623d24---nikesotilixud.pdfIn PDF document text
    • http://kisito.com/userfiles/file/27864648883.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/n3048kigh6gek78eno5ih3g817/narena.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1977f108c---vesudegabulajojuterubad.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5dd0a23b0---lunavusuzo.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/aaim5uhpkm3rbkgao7a5nqv684/17731992801.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/nudawejitikozo.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a5af668468b06754b3d4287b3999e40f/43745820099.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/duvarobirogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=virtual+membership+intake+process+delta+sigma+thetaPDF 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_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 18196 bytes
SHA-256: 79f2ac11dfd395fa403f3407cb5ac6eb6791382a7753d91956006c764d3ee2f0
font_01_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 11260 bytes
SHA-256: 07a391f3d83454e69e10a9ec47391b4edd7bb27dcdd0e62be3caf525b6a666b5
font_02_sfnt_off00013113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1