Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a568b8aff23f33…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 00:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: baaa6846bce9614df88e70f7be1e588f SHA-1: 144d247b3e31846b6d1dd41e5442ec3abe71017f SHA-256: 00a568b8aff23f338a83650e785878d6950971e25a8569de7b2a4731682da359
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for distributing malware or conducting phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of a link farm and the high confidence verdict suggest the primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/29125158459.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1m89fkh8ge1jdjbqc61i70njnr/tapotalelafupadeb.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161361190e35b5---30891976240.pdf
    • http://patanamachine.com/imgUpload/files/kipamipikovodasukemaxuwo.pdf
    • http://prestinoequitacion.com/imagenes/upload/files/36330118370.pdf
    • http://pincesorvarshop.hu/editor_up/furubozopivekatowef.pdf
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/40682127181.pdf
    • https://cmoretv.com/userfiles/6318167007.pdf
    • https://rajatotogroup3.com/contents/files/xipobajunuvisa.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/6c29312e03ab3fb5650a87402a6d521d/48927154516.pdf
    • https://globalmediaminds.com/uploads/files/ruxunulivotetikikekojez.pdf
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/goxeja.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130134ad8d2f---fixilenurove.pdf
    • http://gazduire-domeniu.com/UserFiles/file/wuziju.pdf
    • http://mannadey.in/FCKeditor/file/63018223879.pdf
    • https://groupunsur1.com/contents/files/dusizexilefemitizewugikin.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/74105748435.pdf
    • http://deshdunya.com/blogimage/file/14114320521.pdf
    • http://bookblog.kr/data/file/files/44354743325.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3373mj24edco1q362r2udeq9uq/pakijulejotusejadujav.pdf
    • https://maria-galland.ru/files/file/fonolaso.pdf
    • http://ruizhishengwu.com/uploadfiles/file/132114074569.pdf
    • http://buyyoutubesubscribers.com/ci/userfiles/files/27946534190.pdf
    • http://wintec-samu.hu/uploads/files/fazeduze.pdf
    • http://pietrek.com/MARCUS/files/file/66956072882.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mini+putt+unblocked
    • 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_off0000ccd4.bin
0e06b1b01ea748e939fa5295144566ea28dc8f3f9afb158de5cd2a1824133b17
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD4 17952 bytes
font_01_sfnt_off0000fbb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 16792 bytes
font_02_sfnt_off000113c9.bin
be723ec7a06286f5cb9bd18e8bc88fe560ea979a9d08bc301054ed90ab0c46a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x113C9 10400 bytes