Malicious PDF — malware analysis report

Static analysis result for SHA-256 757b4188f859c654…

MALICIOUS

PDF

87.5 KB Created: 2021-08-30 05:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31b7242854f086ee928344eb1c91299c SHA-1: 366f5bd1e33cc7b2555581d12ed1c15ed56cf251 SHA-256: 757b4188f859c6544127764a6a0acdb72eff4bb62005e2b755b299f7eba57679
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab6d1ed8ed---13556984475.pdf In PDF document text
    • https://hgb.se/filer/file/vusegofenilijoripumewegak.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b885c435869---merovoru.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4b4d2f2c6c3f79d3b9ae2fc1f2998e5b/70689610740.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/gikijija.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b9ba7636e---liluxedat.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/98a96b8e6c9598c00ea1e2ed570bd3dc/xasabogirusi.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/81657994567.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/76980043217.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/jujodixonovenajasigej.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/6215329161.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c9cd07021---kimuwolatavame.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/99746172781.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/gadako.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/68773503723.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/41745678401.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/42771451894.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/es76cesir0ts621sdml7d7dqdu/tukobalinutifedejo.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/80348377487.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9d5d1efdf---navofi.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/nonikigalonanejumo.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/zidifalapuroxifer.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/90628c3d353d7648ad0a3e96792eb6f8/97518245541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+book+thief+full+text+pdfPDF link annotation
    • https://orcid.org/0000-0002-6619-1802In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 10460 bytes
SHA-256: 8d525dbc79930629c1244b66c79258c1cad869be1a3550165b3deaf82ae3343f
font_01_sfnt_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 17680 bytes
SHA-256: 3b62e6fb646e148ff14e353d4de6c0302e29709762083813dff1c348e7f9b322

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