Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc1b3c8b7f93f7d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 21:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b328e3de375c3622893aa6f01706c02a SHA-1: da304dc45057b70acbc933dcf28bb4d202577946 SHA-256: fbc1b3c8b7f93f7d00788e8f1c0ce597b3d9b615116203d133bec3bb0332789e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also features numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=share+file+via+wifi+pc+to+android PDF link annotation
    • https://marljivo.hr/UserFiles/files/53862403363.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/fafisikanaro.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/kevemun.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210904_49FD8974721FEC88.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/kabaritu.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/memamugo.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/vudaxikusefaligulif.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210911211241.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/bifado.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ec8dd3674fd471e8b294a4ad3c95eb2a/fitejepuzuwibo.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/xatapu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab50f42b8f18eda3b415cb33dec68044/solerowafigozanemipotope.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/81864197353.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/lowimujosibinusivalav.pdfIn PDF document text
    • https://kopari.hu/files/file/5524856489.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/sepewopu.pdfIn PDF document text
    • http://ge-mak.com/files/88870377721.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/50cf9ee6239942e6a35bd0892801160c/gekametelozod.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/59913214793.pdfIn PDF document text
    • https://maisonforville.be/documents/file/bapabobolinovuwakisobon.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/22635183344.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/labidiwa.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6267a70d---88685443888.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/66659575010.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/pudowumumosijun.pdfIn PDF document text
    • https://renetravel.ro/images/files/62828152700.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_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 17124 bytes
SHA-256: 111e35fd6cd13a4df5464022e5f8fc6d03e8a7eb7d219950ad69d9101cb1cb9a
font_01_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 10776 bytes
SHA-256: 9e9c49ffd89dd7359e6ddae92be72296efa77ad16318faa2e84288afdffea04a
font_02_sfnt_off000122b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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