Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0879aff3d2e93cf…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 02:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b83ab794875b57e675723db664dd6194 SHA-1: 4fd5443b3c3ee4b78fde7e511b1fcfef3644b7dc SHA-256: d0879aff3d2e93cf7774bc1a7b26605e0c90d8ed5b95b6587111b32b45a2b1c6
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous distinct hosts, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document's primary purpose is to redirect users through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://lobanowscy.pl/userfiles/file/bowosiduromedugewugujosob.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33372258e---vunatazid.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/xowaperewepugate.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/70146514561.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/subagedaz.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608103524c9fc---18124500904.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/32325780557.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607046b951ab0---3852145488.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/gupepifuso.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738e482fca2---dupus.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/57992863753.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/85025798545.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/80145118526.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/dawagopat.pdfIn PDF document text
    • https://chineseclothingonline.com/File/ritixuxiduxu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae8e567478---33694562295.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/zepulijejezor.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/464cc8f44cba0a039a0ac2a6c8840c99/rajojap.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/76520105085.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/d21dba2f3c3988b97154437135de0a45/28218675156.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/pls475t800pog5jnifofutvrj7/39851041703.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/281347653.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d022d12cf31706eceeca0f407c0ab26a/57624155266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=study+planner+2020+pdfPDF 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_off0000c258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 10644 bytes
SHA-256: 4c9d692eace867e8406a617ca9fe0334dee7b98c60bbe973424b1995baef1e12
font_02_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 16752 bytes
SHA-256: 1cbc6c08bcc98c643caa095abbbe6962154c32e8a286d8632a308fe39761e8ad