Malicious PDF — malware analysis report

Static analysis result for SHA-256 6705d80fc556aafc…

MALICIOUS

PDF

86.3 KB Created: 2021-10-07 15:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c15ae8c0fcde41dcd540c109fba56c20 SHA-1: c4cfaaf5395aa18c225efae8d568331eba9393ec SHA-256: 6705d80fc556aafccb944af637e93946cc50d793531e881f26a3286d5a446fac
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1105 Ingress Tool Transfer

This PDF document exhibits characteristics of a social engineering attack, specifically a ClickFix variant, by instructing the user to execute a command. It contains numerous links to potentially compromised websites and disposable hosting, suggesting an attempt to host and distribute malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of a second-stage exploit or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=how+to+see+history+in+google+chrome+after+deleted PDF link annotation
    • http://sunpix.ru/img/lib/file/zapepegilamaxejorev.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/wesadavu.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/80339979829.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/85604861955.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/6314558008.pdfIn PDF document text
    • http://ingore.cn/upload/files/3137607119.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/vujopagewelefukejurawibi.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/17592046575.pdfIn PDF document text
    • http://stylekd.ru/files/59161809399.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e11ed61475---suxozakokejiwabi.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/25803109292.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/22a020a31dbc3edf2cb4c90d94e679ae/ronot.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/32501106221.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/makirajitilotubixebin.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/fijokuzozoxomubab.pdfIn PDF document text
    • https://lordoptika.hu/files/files/70421170079.pdfIn PDF document text
    • https://mehregancenter.ir/images/upload/files/kobumowisaromuxezupudunu.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/15884807946146c7c8d20e1.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/lewowegeru.pdfIn PDF document text
    • http://yachts-trade.com/files/65275535383.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615973beb4083---19805090989.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/55448261667.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c4401580d7ec4715bcd2e1eeb6e77de7/xezetinevebiragowegid.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_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 18748 bytes
SHA-256: 84de4b11872e310b24ed2833d76d7bd008e35ce6724b9f0d78799ab7e31734cd
font_02_sfnt_off000131a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A7 11116 bytes
SHA-256: 6f5f09e6613d4734a14c151a7a8c5f96aa44423531d8e4b205fe3e1cf0afc2d4

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