Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d8e50f7ddfc924…

MALICIOUS

PDF

88.2 KB Created: 2021-09-17 14:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe44b98f04a4ed09c559e8fa1d408adb SHA-1: f47c0e344936fe8e5005748ded5371b1d5030fa0 SHA-256: 99d8e50f7ddfc92485d91963aa9412e9d4eab7fbc1923aedcdaf5392f8ceed1f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms are indicative of attempts to redirect users to malicious content.

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 https://catamma.ru/uplcv?utm_term=stream+schitts+creek+season+6 PDF link annotation
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408e7c2bd3b---37105125183.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/kutisuxefatemesofovuz.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/matipedulofo.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/weneruweguwijezobunin.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/94231606161.pdfIn PDF document text
    • http://status.cz/UserFiles/File/96875151489.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/56420471625.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/dugikom.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/vebiferitelororuzosote.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/fipobowikadizupumoxikal.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/rejixosotofikafepi.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/mujililavid.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/613576c48c906a759da980941c7808f9/75229339699.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/61191919630.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/maxusobonakojufipadazi.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec3474a54a---pepiwisegoleg.pdfIn PDF document text
    • https://zhansq.cn/upload/file/sufatunekalofosawudos.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614438f767ee0---35039906235.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/24699104826.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/35408788690.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384c3054159---bogenupejuvereti.pdfIn PDF document text
    • https://norservis.com/files/files/fumogatunusetadasidowofux.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/vidojasufepumevipiwifur.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_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 10784 bytes
SHA-256: a53519d4d329d644addade230a0f6830a1dda870670d5aa33f6a94d0d018d328
font_01_sfnt_off00010b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 18168 bytes
SHA-256: 1248a3dd9d6c26bfc31eb3f5e3dc5829f45cfebe376c5653c8335d18018b66b3

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