Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbc544f1ca4e11c…

MALICIOUS

PDF

91.7 KB Created: 2021-07-02 00:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 27917c342c92c62a875a8750fbce833a SHA-1: a5e592369b1058566d0fe518e1f335b8a15414c7 SHA-256: 2fbc544f1ca4e11c17f96edbb2f393048ab64fd2298d583ecca2363d325cc98e
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092624cdb1b9---36405008813.pdf In PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/c7lpnv4ro4qkkp8th9fa3ijs2p/78893289192.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/69cc79ee146f6cbb0c10464a976868f5/21946652400.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/q8ebucf0vklfnpm49no6td8l62/66797776170.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb60e195807---36683450546.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3661cda5c---12017772376.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/lonuxagiwexi.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/rs0atn9ugo9utrdmdueifkpb44/89970264829.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/171f962208c322867f1ca0121e4c3814/63067762287.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623628798.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/5611389398.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/86600919206.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/ginuxivazu.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/63806339670.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/21991739333.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a66c769ca03---71716144249.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/silivinikudo.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/82429950819.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/netosedomisewaxuxexaseve.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/34095001372.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb830b055c7acbf50d0126bf569baac5/molubigebi.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1b10ea3369b50b33171f2801fd1e0ee7/41021750130.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/42671944279.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0611b1862be53dc121e2f2da4d533dd0/16479796528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=biogeographical+evidence+examplesPDF 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_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 11084 bytes
SHA-256: 5f37c721d70d904ca8d6b1ccbb452abdbc3536b8968d343c7e2d8a8cd7853c15
font_01_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 17236 bytes
SHA-256: b3582acd845b45080c029a29c2cb6aaf3aa8d1d2227c80056f13b51bbcbc7198
font_02_sfnt_off00014960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.