Malicious PDF — malware analysis report

Static analysis result for SHA-256 78143034ca88d6a2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 17:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2bc5fdab7e0e9b5f22af5f46e60325c6 SHA-1: 9e34e6af75ab3f6c3aa9d2cf045ce7f2383c70e8 SHA-256: 78143034ca88d6a2b7138dc420bde838d110756e1ab2d075dfc64e10047351b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=soccer+manager+21+download+apk PDF link annotation
    • http://www.ondebiz.com/userfiles/file/luderaro.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/53530347099.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/xarobijizalatajuvu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613245817dc0c---vawun.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/junajef.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/dunudusesevaxamera.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/xawupopisipanesubizow.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/fejib.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/getiv.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/72323124700.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/96791120617.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210907003854.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/ruvetik.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/logiligire.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/vubefupiwilojupokixi.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/maxusobonakojufipadazi.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/tebaxum.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909041308964186.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210911140847.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/50157355967.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/83d4d7227d7fd6afc7eea2a8d19b4232/vapiriw.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/zuvorurubufevadifunusit.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_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 10924 bytes
SHA-256: b782e4dd1e4f3870f8ed4282a0bcf52d9795c6fa3022e1059d801a74ad517363
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 17660 bytes
SHA-256: 1fb757bf31cf4669f038c47bf1b7a32c36b3555b7b3bbfc61414f02b84025858
font_02_sfnt_off00011b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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