Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbc8df64593d024…

MALICIOUS

PDF

87.2 KB Created: 2021-09-02 18:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d28393000de6dfb906bc717bbc1755bd SHA-1: c1f42a493f1e3ecfe0beeb38d673dcc170f64525 SHA-256: 5fbc8df64593d0244c8e1ddd22c9f404479e3f7cb90b960d92926c0c41b0f748
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the overall structure suggest an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 http://fecirturizm.com/resimler/files/88459702684.pdf
    • http://younewstoday.com/task/userimages/file/24876138784.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a14c7f16da9886d59851e44054614c3d/63652306741.pdf
    • http://zs-oilfieldequip.ru/d/files/57878563402.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210618194833.pdf
    • https://mollis.rs//files/7127763808.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722d3d1ff10---13821755334.pdf
    • http://aelma.com/sites/default/userfiles/file/82450459045.pdf
    • http://ddaengshop.com/ckupload/files/63693944654.pdf
    • http://lucchetta.net/userfiles/files/50530372745.pdf
    • https://cardion.dk/gfx/fckimages/file/69476144044.pdf
    • http://mateuszkucharski.pl/admin/file/26522626515.pdf
    • https://kawanmto.net/contents/files/99352115569.pdf
    • http://esoftland.com/userfiles/file/111429972.pdf
    • http://provia-events.de/pics/fotos/1/file/17201368744.pdf
    • http://marta-galan.com/files/varios/file/dupememape.pdf
    • http://studiodebiaggi.eu/userfiles/files/41143569580.pdf
    • http://tfforming.ru/d/files/xilasobubejowarisoxe.pdf
    • https://matratva.in/userfiles/file/wijujibegikezadoraguv.pdf
    • https://ferado.vn/userfiles/file/38741332509.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077585d377a0---47273421820.pdf
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31501383364.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/13999880098.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68b13bccbc---lorige.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=life+coaching+questions+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_off0000f148.bin
e75c0b18f1c5a4b8cd5f9ebd559bafbab089871e344862d476bab09c763e36d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 10956 bytes
font_01_sfnt_off00010a1d.bin
0a6cc07a0dbe67f2ab6e304098f39b5aadf0ffab7d4b3ff768f2bbfa51f9cdba
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 17220 bytes
font_02_sfnt_off000136ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136EE 16792 bytes