Malicious PDF — malware analysis report

Static analysis result for SHA-256 32595b948f03476b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 13:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed46c8009590d75d919b5fe41a2e2855 SHA-1: 7220a8b42440f202425d63139a60242bd5e13cf6 SHA-256: 32595b948f03476b50c31e4b96d95b05bae7f00b43a80e5c473e6269aceab016
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised WordPress sites and disposable hosting. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=vocabulary+for+writing+ielts+pdf', are likely used to redirect users to phishing or malware distribution sites. The PDF structure and URL patterns suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=vocabulary+for+writing+ielts+pdf PDF link annotation
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3cbba25e2---71254916175.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/majuxuvimifow.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb685c30e55---wovoxe.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/rigavo.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/34313615639.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6g276its4n14coptsa14rdtgss/fenexokekop.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/fozutilev.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8ad5a95a2c4b9c0b0ed8ca2262a5e4fa/jopowe.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/30877283385.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/lebenaxufivezaxix.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/7272954184.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/bbf6be187f5e3c160404a93b8c3722b6/29567848078.pdfIn PDF document text
    • https://luminex.pl/upload/file/bifafijafaz.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5632117855---14606869698.pdfIn PDF document text
    • http://contua.org/userfiles/file/36916831718.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba3a77c8e9---97603584765.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210730_A9E01685550CAB3C.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/25c6924b91430b1782305085576702e7/lumirodukas.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/mic23fr2k744g7utr5f3cef5m4/zatamebajuwekipadixu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/6tvv9297p2btc65f5ga1un15f9/febumeluvotabiduj.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/72204147987.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607111edb04b3---daguxekekido.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/memapinagidowegudefob.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/varejosok.pdfIn PDF document text
    • http://djapm.com/userfiles/file/mumaseviwatosatutejos.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_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 11204 bytes
SHA-256: 37dde40b14482393c2b0916a885c48b796a391c305db6ee4725e89ddba48c337
font_01_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 17472 bytes
SHA-256: 1b7dc4f3fc39271bd732c4f77c9443f191776f4f132977697e81fc9369a764e8
font_02_sfnt_off00012939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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