Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e98b2a99a5d6a17…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 07:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8647aeb0d2da1341d49548afdca38f02 SHA-1: eff8b0d647ba34b1bc85e3cbca68f5467a7d01b4 SHA-256: 3e98b2a99a5d6a17927cfd352c36435aba9515b55099dfe0b287da16ced5a63c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the structure suggests a malicious document intended to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=2020+almond+nails PDF link annotation
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6c7d831a3ee6c76bff83b072c268ee86/vatavomekitodoloki.pdfIn PDF document text
    • https://architektor.ru/uploads/file/luwajidopamikodo.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/47493672178.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/56197170221.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/vepuzedewelalisibugareda.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/gururovenulamopulepezob.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/godixarokorosivekozotapo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jadonitetuvunejej.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/gupoguroliliguvosalexa.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/a6c6f53d48ea6180b6e1534c89314177/loleka.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/wawodijabivewixufed.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082f62e58c6e---febavabokejasodonowu.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/57887037743.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/76268154675.pdfIn PDF document text
    • http://emannsltd.com/userfiles/66906590303.pdfIn PDF document text
    • http://tayles.com/uploaded/68033165999.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/fuzizukowur.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/99898673798.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/kevofek.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/sokelubimenofujopodug.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/65184459599.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a131c1e8a226d3e3e1510594010884ed/ferixo.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8725d05602c58d91d9661fd8954f28b6/40259093207.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/luxadimifav.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63efacc37e815ca5338477f895c72d16/68802887290.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_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 16084 bytes
SHA-256: b9b4fad63ff441089ab9a96a2e101ea100336e8af67b3842a2dcc1c7c377f1ce
font_02_sfnt_off0001192c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192C 10224 bytes
SHA-256: dd3579da7300b46c35742387a7ef438250d636bc78426f07a4d122fa722734c8

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