Malicious PDF — malware analysis report

Static analysis result for SHA-256 63609874d5e8851f…

MALICIOUS

PDF

180.1 KB Created: 2021-07-14 04:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0d44e16d1d4f6cd7ce04051366a71f8d SHA-1: 006ab84b735c14b5737e64f7a607c1001fe3edad SHA-256: 63609874d5e8851f9eb3be7b74fab8be339f71f57981f395af17c5154c75e543
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites, including WordPress upload storage, suggesting it functions as a link farm to redirect users to malicious content. The PDF's structure and the presence of multiple external URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://laborke.ru/uplcv?utm_term=role+of+osteoblasts+and+osteoclasts PDF link annotation
    • http://aivieksteslaivas.lv/userfiles/file/75131566112.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/wabuvu.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/bemufava.pdfIn PDF document text
    • https://estoniapools.com/contents//files/62018258231.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6645fbffa658d7f24aaae4552c4c601c/mozakidaxa.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/66653537101.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/5699608841.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210516055507.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/wetitavuxiguwelepidarujog.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6f2540080f30c5f11c5ed6cfb6cb9ba1/9415691460.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afb296ccb6a---sogoragap.pdfIn PDF document text
    • http://babamoleskine.com/files/file/woxej.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/ee4c505865774f076e60d04ea996f56a/6461579269.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/0f7db288ffa03250616e58a5de7f2210/12402208763.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7ac03991d---tonurepikaxavibujukiwoz.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/qkhsqdlmoc1cumneb8cthv3nq6/22351022595.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0811b32bb---nonezivajifokaxax.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3321741716bc20051713fa7d9f515b0e/95438589279.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/mupusuriwelerolaxeninubaz.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160983dd42e3c7---vitovifizi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7cbbe4994---zokazeti.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/juburekarizazora.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160747a73a826f---remurogefimogirikevolon.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9130ad821---50157948809.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_off0002618a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2618A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002799c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2799C 18372 bytes
SHA-256: 43e4a85bec302472f9fee08ac9d3da329cbb7cea835aa0ba005aee6a2a8c20b0
font_02_sfnt_off0002aa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AA5F 10464 bytes
SHA-256: 6bac82e8291e93d307296fefedc00b79a2b77f99df86a248d5656fc44f4d2ba6