Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d714f545c3942c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 16:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72b3cb330e140fa01b6f4cd7d00ff389 SHA-1: 44795d45a5b9f6ae31a40b9b3b0d62707cfb559b SHA-256: 68d714f545c3942caa30ca6af6d6788a609e3f33673eb2421a7590ddbe8f991c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wasserburg.pl/userfiles/file/13804991538.pdf In PDF document text
    • http://sziazsauto.com/uploads/files/famesefok.pdfIn PDF document text
    • http://puisan.ru/uploads/file/busafubaworokolisapaf.pdfIn PDF document text
    • http://zaiger.ru/img/file/86658417722.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/51179557183.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/71026314875.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/91374324103.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/u1q13uudpuaq8lih8rlolccshn/43408562521.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/31213514841.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8206adc6---69021249295.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/24480951825.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/vigejumisanet.pdfIn PDF document text
    • http://velisend.ru/photos/file/43918550652.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/20129043957.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/88078724053.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9195d9fe4---mupikonuzevujolupuja.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/nibopolelinajutafazu.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/11554601269.pdfIn PDF document text
    • http://synphabase.ch/upload/file/63066784533.pdfIn PDF document text
    • http://elitacasa.it/images/file/37676540289.pdfIn PDF document text
    • https://toocapen.com/files/67196535985.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/73653861224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sivaji+the+boss+tamil+full+movie+tamilrockersPDF 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_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 11100 bytes
SHA-256: adbfd7df7cb859e8afbbf24b7a45551a94dff6f1e79095e8c904cf8bc0eb8569
font_01_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 19268 bytes
SHA-256: 36b558d8a06d3ac2dc76fd3b999d238b11fd903711982dd5323a89ac3eb6bcf9
font_02_sfnt_off00012831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1