Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d23c3eccfd1d94…

MALICIOUS

PDF

71.7 KB Created: 2021-09-14 00:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e3bbc1362d21ab2b9022b1b8d2d37ae7 SHA-1: 1c28d21d9c9ec32f8d19b4924ac17085a8fd09dd SHA-256: 22d23c3eccfd1d9414e5ff11aa7c8236c0b2c2ef62179ec1742803de59541aeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://cyberbirddog.com/userfiles/files/sosedimipetonopejoni.pdf In PDF document text
    • http://moskvaznaet.ru/upload/files/komisukuduniv.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/rugalirogud.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0e578b83e0ecceb50775566e0d4c88ad/zexezubupexupifekuxuwirok.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/93955165831.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/biwev.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc2c57e1d6---74709016742.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a4a74921dc49421fa45262e3d8be7ae5/xekiwilojulogiw.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/13889705424.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/28317206208.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/2183074965.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/pumaboxobolewikuvab.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/kogududago.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xeziloturenirodoxo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdff516785---52273817451.pdfIn PDF document text
    • http://prograsifkalip.com/files/83926249852.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/55327282660.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/95139606202.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/51048244454.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/6497650446.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/guxivapanovokapubowar.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/67594434644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+realm+tutorialPDF 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_off0000b877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB877 16092 bytes
SHA-256: 2965619333c992f8972bd00bbb2973864f50f7ddd0e1bcdcbda38fd15e8f518d
font_01_sfnt_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 10324 bytes
SHA-256: 3bf0e584569a8cf05c949f8b658766581b68149362c1a6f346f7e69db184683d