Malicious PDF — malware analysis report

Static analysis result for SHA-256 395899cfe0cf2398…

MALICIOUS

PDF

96.6 KB Created: 2021-09-18 20:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8ae10a52b6188fb3e02687593c94b738 SHA-1: 541b7ea54e47c4f6eeb67096501077564b9e2037 SHA-256: 395899cfe0cf239888bff6dff1e16daa5fe774392b55afe204cd679dc6730756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://himalayakebab.irafbrothers.com/shipinc/userfiles/files/96354472956.pdf In PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161444d30aaef9---nugipuvuzomuxipedav.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/rolajalonomeguwu.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/12010361913.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/nubejavezorebavodubewof.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/sifimaxu.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-10/20210910195832144497.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/48047401039.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0cfm1859elrqhog11abi43peh1/nazavipon.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/51553928030.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/93796448436.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/35549420546.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/44237064331.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/rekixagabojal.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/rk5qjelas1ogr580bu0tqmtofr/25196353127.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/mamudufizedijenefugoxax.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/kiwulubesomisosi.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/8243991455.pdfIn PDF document text
    • http://ccadl.com/files/20210906014338.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/53102082234.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/19009864433.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/narilifusivuteloxelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=wonder+woman+1984+full+movie+2020+watch+onlinePDF 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_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 18404 bytes
SHA-256: 10087c3eca9ae2f7738e9b4ae21f324dbdb141a024350d66b7ec9bdfea193225
font_01_sfnt_off0001412a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15941 11564 bytes
SHA-256: 2b726b203db7e8324424db38eef8d719dc70700b5133165326a10c3dd4640b09