Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7c2147d79c13cd…

MALICIOUS

PDF

94.0 KB Created: 2021-06-30 09:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 274ab7330543b56a53070e4b9c386f7a SHA-1: 7b6ca37138e89a90c9d7c63a7cdbaad9c878f66e SHA-256: 8f7c2147d79c13cd0722e6045f60f18359bbef2d0e4faa13af85a348977f15d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised CMS uploads and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://catamma.ru/uplcv?utm_term=hennepin+county+active+warrants
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/imattbdgjp7nltjiolikqknn95/94720885919.pdf
    • http://bitite.lv/media/txt/122/file/91959896368.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/70b567c6d0a60a237fb5cdf2f4e9e998/16907037588.pdf
    • http://kovacsoltvaskerites.hu/images/file/82898018099.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c23d8a8a987d1de81d13fced72e4a1c4/biwifozuxoxak.pdf
    • https://aawyx.com/sites/default/imageuser/file/30283224767.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/51003cedcb9a92f270ad4cccddff5401/69633970772.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b9a5045f---27872016617.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/88latrerup05gjtig1glm0d5dn/77247367170.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609ddf49bd7fa---49062578317.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4a996169db9a986c7118ff692337aeb3/notozupofixetafulo.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9cdc1c4e---70165591358.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac8780220c---76079153372.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/sd3h7f4s086bnqob481rqdceu7/venevuwevap.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924ad05f413---34322525060.pdf
    • https://minegociomiweb.com/userfiles/file/resit.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde29d909c5---86117825784.pdf
    • http://dienmaythanglong.org/uploads/files/vuraxovoz.pdf
    • https://rosycaffe.com/file/xinifurejozateredi.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/536881025.pdf
    • http://bright-inter.com/file_media/file_image/file/sademetuvidejuravofug.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608897c321edc---wijinij.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/738d757460eeb7f3891855990ae8a736/xotegoxiresejuledopuxina.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/12246175586096d1f19f765.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ndcl8gumf6ou8artb170kbmrkr/berimomibijutajutiz.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d473fb833e7---25378935926.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777f647e530---51996708268.pdf
    • http://palami.by/images/file/ruwijinitukitu.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_off00010cb5.bin
8486c9f21b7fa0035210ad4408b4fa729bfca71f7036707dac971d544f81a49c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 17024 bytes
font_01_sfnt_off0001396a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1396A 16792 bytes
font_02_sfnt_off00015181.bin
47f46e17a6b109dce9778a36737929a33772247d5e470c37e277c070f7917a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15181 10676 bytes

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