Malicious PDF — malware analysis report

Static analysis result for SHA-256 4583755058584c76…

MALICIOUS

PDF

123.9 KB Created: 2021-07-01 15:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0c47f2bab20c3b9d168c7dda2038eb22 SHA-1: b0c3c619c112fec8752500de98496640feabc71a SHA-256: 4583755058584c76bf3852b9511d748637cc544bbf58fdc31bd395aac76fba74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f920c050de---domevonitumizejosazer.pdf In PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ck83h8pcu0no5rhqa72m9ut3f3/sugoruguvegituguxabed.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/nababorilebuleporinugi.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e3e3cb84942efda61e580e237c511858/poximebifokuwiboda.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/gemevutevenukij.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607455515c25a---sutogowaselulilosupap.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/041e3979deae44eee1e4592c5e15d90f/zadagikarujaxivuwenok.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc63fb0e92a---mebisarix.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/17ffdefe682b7113a9d62d2a5d9c3cf6/mimozusofijurolu.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/23097025888.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/152e004e1b9871a778f517cc09614887/96084020437.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b503f7b511a---kijevod.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/cebf851ff3c575718307faf261c2ed64/debuken.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b39b18bc28e---semopub.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/93094514835.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085af08491bf---fukijerut.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210604061841_2075466101.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/kunifonot.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a720b9001fb---30301869894.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/50425545213.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ae06cbf92---16433928883.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c627a61bfdd---kateruwoja.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b2861de24---86249189875.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/fisid.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/nepewutupafexaxaxotinojom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=consequences+of+rapid+population+growth+pdfPDF 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_off000175ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175FF 22956 bytes
SHA-256: 63cc3dd5b04e4fbf58d9078243ea08f01c85c74499f68fa055fa18505bea3db9
font_01_sfnt_off0001b03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B03F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C856 11260 bytes
SHA-256: 61fddfddd8952130227e2a2b13488a4509f0d1c3b0a0cdda596c555cc6ba2349