Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fa6be7444ec341…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 13:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51b0a0cc38c96de6da0553544e9ec88b SHA-1: 80ddeeefddd3cdd0578909cb7ff7841a4e14246b SHA-256: d5fa6be7444ec341418ec98b585a0846c8397864363a5d78c83381165381bf7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. 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 0.9953

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 https://chcial.ru/uplcv?utm_term=used+to+english+grammar+exercises+pdf PDF link annotation
    • http://zgkimsteszew.pl/img/upload/files/10578983594.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/11300464380.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/37371002192.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/moposufonutubasirutufeb.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3bb4882d---16593937420.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/8be203dfbe80c7572c3f327afa0e91fa/rofazitutiremawom.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/raxaxipuniz.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/zirowulaxujejenekovo.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/kebaxamonobosunef.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/83983412621.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/87008522439.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/99568587886.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/weradabinibewijiwisom.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161336ddb61ac8---80024870517.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/23532750028.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/kisaxuvixox.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090600163673499.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/70939607273.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a86772e4dd64532bcae6dfe786a8039e/32691824867.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/23212886327.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/36791707758.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/66839786488.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/14750373229.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_off0000ca0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 11176 bytes
SHA-256: 0737e9a206a1ea00dd5e405a207f41e357ea88222931b0e8fdeff9e6fcabf6b3
font_01_sfnt_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 17708 bytes
SHA-256: 4a0e0e11fd43226ee3085c7c1098eadc4b8ea3bf19d613be98742a39482e977b
font_02_sfnt_off0001114f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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