Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7849c763e13734…

MALICIOUS

PDF

75.1 KB Created: 2021-06-28 10:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c7d7b424ec501abe4b31ccaab615b57 SHA-1: 742938c9e58cef78da1304b895730e113d0fab94 SHA-256: 4b7849c763e137344311c670f191a0e2edbdf5ca6416ad37df990aa7dea6c32c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=colonial+village+roseville
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4104b6e5aed4afe4b73f21e59331355b/joleveluratokapimo.pdf
    • http://applexin.com/ttpsea/files/file/65887087793.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/57570194620.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad49c591825---befuzomo.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160825fb2dbd79---xolareb.pdf
    • https://alnahamgroup.com/userfiles/file/tixugenoti.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160947984b5e96---wodewijo.pdf
    • http://yuanyoujie.vip/userfiles/file/24054187436.pdf
    • http://abc-tel.ru/data/File/ratigefawusikuwewotag.pdf
    • http://applexin.com/ttpsea/files/file/99946288817.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/9uucagomuen8ivup0oknvn42tc/95966980229.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/8285006060b92c5ea23d3.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c6ba458710595a5b4cf434daa09ddae3/82850561672.pdf
    • http://yjsyrj.com/userfiles/file/rajipajapofilifosofexosa.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6c6556b21---32122903396.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075965c83deb---detejazuwiki.pdf
    • http://matstravel.ru/userfiles/file/64551780653.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qstqh094p1mjr6okd8vs7s13g4/wolunotawoxi.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bfde6985f---27758550028.pdf
    • http://hanboo.cn/Uploads/file/2021062003301070554.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/128505fc2c7567beade2f95bdd76bcef/36680678036.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/gutemobetagufit.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/bowosasodurid.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8177b2c0e---64079903635.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/26733d905369a4a17764a468ef8aceb5/wijumotonajeruwudez.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_off0000c4c6.bin
b52a49a543230f9a445f926de97ed395b357f4806d9e20f73e8589e4a70785a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C6 10280 bytes
font_01_sfnt_off0000dc0c.bin
c84fd8c7a9cbcdf246d9953310fbdac260d6ef5b03f183cc098063921fbb2513
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 16660 bytes
font_02_sfnt_off0001075b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 16792 bytes