Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e500d8daf62f2a0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 10:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 772f65df90c9f1f7cd606deeaa58c3f3 SHA-1: 7fbb1c63dd03229d83295dc575c42ef95fa588ee SHA-256: 8e500d8daf62f2a007fde76f4118c57ce085e2709a8fbca5d3d6cd1ddab069f3
176 Risk Score

Malware Insights

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

The PDF contains malformed streams indicative of exploit code, and numerous heuristics flag it as malicious, including ClamAV detection and an ML classifier. The embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves luring the user to these compromised sites, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611860fcbc761---mebivugudasejizo.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6a153c2b1---jigigifawad.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/janutu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/amr677ojoagrgnhie8bv93823u/62019830778.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/vemezujiwipokibumo.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/wusuwezilabid.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e0ebed4b---72936012807.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083673510df4---xujoforiraninirezixusaro.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/98168315263.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/26148244481.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/92687389906.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210802200155.pdfIn PDF document text
    • http://m2m2design.com/userfiles/vifanubo.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/9823633798.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/26596866556.pdfIn PDF document text
    • http://metallpress.ru/files/11443593831.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/vidijasafix.pdfIn PDF document text
    • http://damutech.kz/upload/2021/08files/2108262150043760225dlyg.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/80457313261.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/98581343730.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/merazodolazofipupo.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/42804585307.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609649cd2e174---2705142791.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42aece4345---wawaxomuxugomifigakivutef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+witcher+3+temerian+valuablesPDF link annotation
    • 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_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 16988 bytes
SHA-256: 9f504cb438707ceadef47bffd11314120e4f9345e8709a029d20ee7015bf2ece
font_01_sfnt_off00010c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 10900 bytes
SHA-256: 72c10fba1486070622224a39e264ad4ef03cd093b9d53da4c580b21aa9a9d4bd
font_02_sfnt_off00012591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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