Malicious PDF — malware analysis report

Static analysis result for SHA-256 21df37369ee7e641…

MALICIOUS

PDF

90.7 KB Created: 2021-07-22 18:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0fd326a8fe78c7f638a645a3d1391ae7 SHA-1: f79c7cdb8e03e77af972744dc9573ffa5a64efc6 SHA-256: 21df37369ee7e641a79f262d003004911d817fe263a1648e0e7680771de231b7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning. The embedded URLs and the heuristic firings suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://nmg.lv/img/uploads/files/26288590817.pdf In PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/0ff512c5932206a48e3a95c3d2046c21/sogasepuzipoliwufawuzof.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/gaberitaku.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/belobexa.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/69061904999.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/zamotusisuraku.pdfIn PDF document text
    • http://iphysiology.ru/upload/gilalikesebalufaditol.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4315f6373d---99493417445.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89e64a5ad---95391401587.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/97662946973.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/mumanubebanesirexo.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/53888167284.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeabe28cf4a---75092180570.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/32350233527.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/4gftt58cbaj7g702kpdc41c4e7/14636376319.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3cfdc6f05---liromu.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/87399682351.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/52888801642.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709e27e79b9---nekinowujagepapipisu.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/39900571478.pdfIn PDF document text
    • https://p87.hu/files/13631797349.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/043r7rbbeqbjj0kfl71k73ipt7/11822538612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+words+of+a+madmanPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0ce38703cebe9968d7b8358c7c457fa9/46153309527.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00012b3a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12B3A 28648 bytes
SHA-256: 1812f98a319a3d7e39c7b40e963c5bcfad4ce124770453a283ca1b627a367ab8
font_00_sfnt_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 16212 bytes
SHA-256: 6ccb4d90fc5f4b7f714401c2d86ddddc43067bd319301f7b0deb7f4d6d8a7166
font_02_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 10432 bytes
SHA-256: 186e4c8b5d7106dbbede845c085ade4704cfe556a1141a8116e47282f56778aa

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