Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63881e3e104681b…

MALICIOUS

PDF

88.9 KB Created: 2021-06-27 08:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 268a05b3ae4df6fe452955bcdb143714 SHA-1: 4e0482e92bc19688bba1a73257fa1b647b684073 SHA-256: d63881e3e104681b838fdb1e6c2dd3066f3d83ca088ffa7f1033fa4488573df2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous PDF files hosted on compromised CMS upload directories, indicating a distribution or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malware delivery or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072128a3af49---73909700738.pdf
    • https://circolodelpistone.ch/userfiles/file/34109796782.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/brutmcucdh78luokioila1bofj/mopivelafozamux.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b6fa085c2---nugovuzetovizog.pdf
    • http://playbabydoll.com/userfiles/file/34610810602.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/vutuvadajubop.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a7e341169---lukunivon.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7dffd299bbd8298f8a267ae7d84e61b6/40706266139.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b47bb1aebe4---duvunufowiwataj.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609822b204329---72681248552.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a680e88a491---wifokatogufobe.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e85e1fa818311a99855234d10f93cfbe/vojovuvabibusopojudal.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/8790372036.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5c77edfd3e9be9658f595c656665dc80/69406426211.pdf
    • http://detikakdeti.ru/img/file/ragowoxuvujefirozobekeno.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/uq8m40e9q2l2e4ou7gi3e3plgh/wetoxipole.pdf
    • http://neurooperations.com/ckfinder/userfiles/files/fifuwologovo.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/a6068c352d0a855628e04740a5dd9849/rikuzugatibexebokuxiz.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8128298b23d0308fae2279e4ea1749cc/tonalewabevefose.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4aa0310a43b4f7dbdc5c764d2ac559f9/fezakopalotavopupej.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/73f37fb0a65fdeda202bd12c7be40326/17088025252.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/79bafa2a28f22e58a939340fb0b2a6ee/84031607693.pdf
    • https://astek-telem.fr/userfiles/file/97959009431.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=80s+music+trivia+questions+and+answers+printable
    • 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_off0000f3cb.bin
58bb32bde914ef894151ac8d85b96df9126cdf7912b2baf4069c470cc1a2198c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 11448 bytes
font_01_sfnt_off00010e61.bin
44d0e4bf1f7fbf83461badac8c2ba055a585a805bc5ee7ceaf9ece0e8044b474
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E61 18436 bytes
font_02_sfnt_off00013e2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2D 16792 bytes