Malicious PDF — malware analysis report

Static analysis result for SHA-256 4702204261d4f0cd…

MALICIOUS

PDF

86.2 KB Created: 2021-09-19 03:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 162744853603c63445b187e4cf068205 SHA-1: 5bbcd16dec6b7c2700bee33ba3f6dc03129ac86a SHA-256: 4702204261d4f0cd955150541397d1057cf3c0ed9e71f2063fc5b077842f1898
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://santehnika34.ru/images/file/10597928020.pdf In PDF document text
    • http://influences-vegetales.eu/assets/Image/files/valipatuveduragijawolosad.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/16476916502.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/88015770124.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/84cb695828f40323126d07cb4998bae5/zerupanekokitidadaporazi.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210903234953.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/f101lmm6mreijb3il2pss07n76/11210222412.pdfIn PDF document text
    • http://iscelenie.info/files/file/474587658.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/vaputaxuleri.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/faxezapifuxawizopune.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/14072940837.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d553da7836375537f82376cba0165027/65281396270.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/34269748528.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/soxujulebejap.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613167c5bf598---59031058349.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210913012537900992.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/75807771895.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/4fabc1bd55938aa085b7b1545e3092a5/36258754512.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/xejabotogatuduvaronum.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/9720863888.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139c22fa9b0c---51015738706.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/53799812329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+lento+como+resolverPDF 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_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 19208 bytes
SHA-256: 0ad2abeb436ee8c9090de797c1d89911b79ecf32b97e20a8bf7293dbe63fc68b
font_01_sfnt_off00011b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 10416 bytes
SHA-256: 069b3f1cef17cb389db7601620b04faac9b495a81e16d33d5f21d235828c3daf
font_02_sfnt_off00013335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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