Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db44415c66abc91…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 17:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 244bf73f66ff9e2012cfdec6e22642fd SHA-1: e6030a9f69761b1462d853ea1b1349bfa8d423cb SHA-256: 0db44415c66abc91f592d5f45a0effb7aaec0086931548e4d36c792a0d678f35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely serving as lures for users to download further malicious content or visit phishing pages. No scripts were extracted, but the PDF structure and URL patterns are strongly indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=how+to+quickly+uninstall+android+apps PDF link annotation
    • http://ativn.com/upload/file/warobi.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d7f87645d---22065169696.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/tezuxad.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d069ab2c5---vixodoj.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e8f133464---79039658033.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/zivovaletazep.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/zoxexusaxibuzeve.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/61255755768.pdfIn PDF document text
    • https://questyme.com/userfiles/file/suwosewowomovudafunob.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/kejevipizolage.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/70958324859.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/26877525396.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/de7e28354846165d6c6cc89ddc0b920d/selufuj.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/kuwefinojisese.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210905021641.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/857f5b146f9efa2bd95796e0edd8ecde/93980134000.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/79341129542.pdfIn PDF document text
    • https://sapporopools.com/contents/files/fimivuko.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/78077743493.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/worapubokesixas.pdfIn PDF document text
    • https://csodamalom.hu/files/files/35478696309.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/57599152741.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/bulasilofazukumurovoxux.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/89540307344.pdfIn PDF document text
    • http://a-pluset.com/userfiles/25212893989.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_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 10904 bytes
SHA-256: 39579750abe762b0bd567e27ecb78f184f9c5e0ca04a8ef1f5c62e193fe06424
font_01_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 18788 bytes
SHA-256: f2f5ca295711e2bd50d9ae059d769c2ce61accaa70204e7879ca190e03a7ab00
font_02_sfnt_off00012910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.