Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c7e6959f869922…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 20:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e642fa9b963f99b95d8a83f8fc3b6b24 SHA-1: b8f250595bf72b25008b2b7dc2a294fffe04c2b4 SHA-256: 89c7e6959f869922c9cf115b51a8be77ebf1c58cc3440f7018ca249000630d19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files, many hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure suggests a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://allytemp.ru/uplcv?utm_term=how+to+hack+kim+kardashian+hollywood+2020+ios PDF link annotation
    • https://mongolia-volkslift.com/uploads/files/mobobusepigutosan.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/zisiwuzimivejajelazumu.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/metanuxusogukinuj.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/fuvijojafegenapigub.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021921162565937.pdfIn PDF document text
    • http://bienbao.net/uploads/files/17769358853.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/87612682285.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/vopugudobujir.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/24515887945.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/tegipewekigawitufexeg.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/tugiramidigo.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/xenopivunexagogegelifog.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/96142614840.pdfIn PDF document text
    • https://bu8m3tas68s-b1.com/contents/files/zebaxu.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/62568824400.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613503116f6db---21550355648.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/rekavadego.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137f723da9fe---34343674586.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/3uesksupbpne1ltbtr71b1cm00/vogoluluna.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/70141351798.pdfIn PDF document text
    • http://hasyo.net/files/file/famulo.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/23458004846.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/jelopamedemovoberada.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/wofavikuludi.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109160505055994.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_off0000b041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 11028 bytes
SHA-256: 4e236d1bcd71267dbef39662093d256a34af4e4b1eb963818e5109d0721720ff
font_02_sfnt_off0000e1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 16272 bytes
SHA-256: 5f2b2b99f428886357a5d90125e766aaaafd33c9dd1052e1ff7e113a0330ffd3

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