Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c39353b71b48920…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 13:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ad55157e12a516ecfda37c6852021e0 SHA-1: be1bc943b30ae0a63befa8fa6d5a21dc25132673 SHA-256: 4c39353b71b48920574b34bd6ae27cfef1b219abf08ba7d4545a2b62ab2d685c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a social engineering attack (ClickFix). It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, but the presence of external links and the ClickFix heuristic indicate an attempt to lure the user into downloading and executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=how+to+make+a+server+in+minecraft+on+android PDF link annotation
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/xupirawififodugenusu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/7t7o0dtg9ivv473ulg034tot7q/22250466067.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/32225638154.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3c83599c4---damabetevilopa.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/japufuzutolene.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/21604272321.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/17722014465.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/8v48cs0l6da884jjne8dhc40t4/naduguxurozoka.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/86567562502.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///58236792052.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210907181024.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/murum.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/dixomexifapewaniretixod.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161363d51cc1c7---lebur.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/nexanovifedunu.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210913190947.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/wisifanibix.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/41413134179.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/9651318903.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/557993475.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/42912730403.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_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 18736 bytes
SHA-256: 009e8649ad2c4b6dbabeb59c0f8ca8be9f760d409aa48582fa7e45c4d547e1f8
font_01_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 10828 bytes
SHA-256: 62e8116b53a1d4bc77a43dd3f3f6f032206d04dc76fa9615095ba9b67241481d
font_02_sfnt_off00012270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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