Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b83d931533d79da…

MALICIOUS

PDF

83.7 KB Created: 2021-07-13 21:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5c48371cfbc602b01bcb227df7605f6b SHA-1: 181365b76417fa0993f43fac33941a069fec34e2 SHA-256: 0b83d931533d79da9d0d68aedafe09be41cb18708f5b22e44d60edcb98bc306b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=disinfecting+jars+in+oven PDF link annotation
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b96dd037f9ea38351363249412f166f2/22424145402.pdfIn PDF document text
    • https://asiabiru.com/contents//files/kesozane.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/finikefedi.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/fukixotaruvoxasawunufe.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/17847918907.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/39050843134.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/18395904950.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/66639870157.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c5550027e95---37475744254.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/tinikisepuxosuzuwofagurab.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/zedesemufawasedutalilora.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c3f240eeb---48557124940.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/lepisinamixebekemogoxo.pdfIn PDF document text
    • http://lemfhafamilylove.com/clients/a/ae/ae548a02e38cf20d1222216853584fb4/File/49002540458.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832633ab6b5---22719025288.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/36994274075.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/larumakepa.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/selagalepodiniwekavi.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/vuwugekefefejujadazojawe.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7pc43qac9dp7m09k1dv3c0lfi4/xozanafovogariruj.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/73881361294.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160887c0966051---sodivepebujatuporul.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7edfd87ed---fopinuvutizodubafedawo.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1ce22e14---75238975940.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_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 10664 bytes
SHA-256: 0cc2c3edc0357f78522544ac4d520127d6204503fb9ed0c31f19745cb5f6c26a
font_02_sfnt_off0001173e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173E 16412 bytes
SHA-256: eb16304a815ab8045cf81e1b61a163ab5031ee1d8dc34255c0e1ae59d489d299

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