Malicious PDF — malware analysis report

Static analysis result for SHA-256 960b2af9a98fc9c3…

MALICIOUS

PDF

144.3 KB Created: 2021-06-28 01:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa829bc833091ac44003949b9ad8ed30 SHA-1: ee4f0e50865e6f0985c218a724ec154c348c973a SHA-256: 960b2af9a98fc9c383c829f5fc86569cf914317a46f67b7c2983e296d788bf41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting, suggesting it is used to distribute phishing content or malware. The presence of external URIs and the 'SE_DOWNLOAD_BUTTON' heuristic further support its role in luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://inwebjor.ru/uplcv?utm_term=patrick+peterson+madden+20
    • https://malabarmail.com/ckfinder/userfiles/files/47511640260.pdf
    • http://stalmost.pl/userfiles/file/15187613873.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7751df80---sosiradowatagel.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/86stvqnhsb3b16pp35h83d17t7/57787746270.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607402f05f099---dakobef.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ab582f954---932606712.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608335bca2f42---36056275090.pdf
    • https://aashianarealty.com/file/40084203355.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714eb939714---52675583791.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/77ded6082ef981f382236b3c2992b91c/50642217763.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b16ad6564---1588481592.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160741fe6a6f75---rovupenawedexotusibi.pdf
    • http://alfavit.tv/userfiles/file/43189974527.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/e0d2f9e03c7139f9583682dc190e4e51/74441441682.pdf
    • http://akinmedikal.com/uploads/file/68546602823.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901318af98b---38280880430.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608218aeeabd9---titikepefugowalifu.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607790a7bbf54---dugefudiwapemifuvuj.pdf
    • https://shibbirs.com/media/files/32351954818.pdf
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/bovowitawodusuru.pdf
    • http://someteme.com/archivos/_20210617144828.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6705ce5a3a06ddd886bbff9e678c67f1/94616387295.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d95549719---dutulirebepekusoxuxivez.pdf
    • https://susta.vn/userfiles/file/87032104074.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d005.bin
db80d54c6d91f884d9f7ae4c41e279cb2958e6b9a1f637d218d6040fd5640f34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D005 19304 bytes
font_01_sfnt_off00020218.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x20218 16792 bytes
font_02_sfnt_off00021a2f.bin
5947c18161a90ee36fb8b37436892bf3f6a524e2c75d5d2fbdaf146d6a51c668
pdf-font-stream PDF embedded font (sfnt) at offset 0x21A2F 10964 bytes