Malicious PDF — malware analysis report

Static analysis result for SHA-256 3312dc0fba299c7e…

MALICIOUS

PDF

90.2 KB Created: 2021-06-27 03:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 500147dbc76477185978cefe31157a07 SHA-1: b960a2eab3ace0bf98d2746c531078b172a8cba4 SHA-256: 3312dc0fba299c7e4636a5f243e189555798d8c4c194ab13067fc61b7bdf3de1
176 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. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4d7fa5eeb45b34737b221f4d6726dd2c/39933328650.pdf
    • https://cherrychile.cl/cherry/uploads/contenido/files/zojipiguk.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/cb19rrdavd7mfbo4c6vin23io1/fovanubaxufoj.pdf
    • http://sakuragiramenandsushi.com/uploads/files/tekifibojazemibazifew.pdf
    • http://usaoxin.com/userfiles/2021-5/file/delomifilevutotonin.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/4da380bea15e688fe7a61444f2031754/rezufovamazal.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/56c1df2cc28c289ed7e96737bbfcebdd/befoxob.pdf
    • http://aven.su/userfiles/file/mukibebibefisag.pdf
    • https://badoza.net/userfiles/file/kabajorixopafelininab.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/822ctv1nak4lnm8rddumb2s6k1/1144979378.pdf
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/58257596332.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b360ce283---87868556793.pdf
    • http://brilspa.ro/userfiles/file///furorezubivosezasog.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c35vlhllr941rrq7o3o3i2jke4/72191522613.pdf
    • http://www.bandungmesin.com/file/raxelowa.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c06468493f4---80452415589.pdf
    • http://hayatteknoloji.com/webimage/file/dajafoteromeveragefunot.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/0q03ubvl7amnkk9hbeaip8d6de/mopegimoveluseseduse.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/pedanobomaxa.pdf
    • https://prtl.pl/userfiles/file/71663613827.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160762a125d121---30101985658.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+make+cocowhip
    • 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_off0000fdc1.bin
63c2238fb5a76b6d585e532469e2a6b34aad2e2ad36cfcb5b2d3f0b38b776bde
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 17800 bytes
font_01_sfnt_off00012c66.bin
3b028c36e9b3d1c0fbdc141d5dea009d04068ebf96480539e80a8bc00b11702b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C66 10392 bytes
font_02_sfnt_off000143f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143F4 16792 bytes