Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37edd3de649e3c5…

MALICIOUS

PDF

96.1 KB Created: 2021-07-02 09:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57572f556ba00df159bcc198f2b0be10 SHA-1: 0d3727b479dbeea15c9c80e6457a22e23e48ccd7 SHA-256: a37edd3de649e3c5097bd9c0b84c433e9e4686552fd820751fc842df8cc3bd30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as lures to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0354dba445331a3c00703a49c97a6027/58059650249.pdf
    • http://alanurturizm.com/rsm/files/bebujuluduf.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f8b4df69---buvidakekileterebakexi.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9788266b30---wuzegorififaxumeji.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833c73bbec6---79813699216.pdf
    • http://beiwendq.com//data/attachment/file/6885483370.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/24590219867.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec6a2a0d6f---79410642603.pdf
    • https://questyme.com/userfiles/file/22657412183.pdf
    • http://pandoreunion.com/clients/81456/File/welugudanikolasozolimug.pdf
    • http://hjtech.org/admin/upfile/file/80054478673.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/39bc09f0e0604f7541218566e00e1aea/24586635302.pdf
    • http://leadershipcareer.kr/fckeditor/_upload/file/60136155181.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a43cfd73fc8---20355880345.pdf
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/banofabinesume.pdf
    • https://cabsfromheathrow.com/userfiles/file/goparawomisesigosowegas.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/871bde0c9e920924106734c96ef4e1fc/sixigapiwamatupapopijetu.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160838c51be03e---88231164256.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/eclnam1dtu48kc98dq57psg3u2/14854254703.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55dbdc8ace.pdf
    • http://secretinvitation.net/images/files/meroretufufupesabo.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac649593804---jejupomuxipogaxunakaxal.pdf
    • http://abwingsva.com/uploads/files/kogozufuvotanemetif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=english+coon+dogs+for+sale
    • 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_off00011481.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 16792 bytes
font_01_sfnt_off00012c98.bin
4e4767119fb50fe21104f48323ad0e9d0477446a185843f89226f5090e8bed09
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C98 10640 bytes
font_02_sfnt_off0001449b.bin
c740d700f958741793104a347b35e995da3aab8c35ba0d1b0de176515e88a9c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1449B 17780 bytes