Malicious PDF — malware analysis report

Static analysis result for SHA-256 3643b7bd853fc76a…

MALICIOUS

PDF

94.4 KB Created: 2021-06-29 16:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f12608f259f482daac26451cf7f5808 SHA-1: d9bea8417f753a34b5ed9f0f305d1d97aee9ea5f SHA-256: 3643b7bd853fc76ae0b4bcaf3a71ef1edfa4d7f11bd1cd44941439eb8851c875
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to external websites hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings and numerous URLs are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://iveducentar.com/uploads/assets/file/judukanizazakarajosiza.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4769d2cee33363a4f107ca8f80770709/gepaziwomexuso.pdf
    • http://progfin.pl/userfiles/file/zuzuziwiri.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/24sl4egik68gre16a8dnjfqpc5/5263468307.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/3d6902a6e936665397f3097488ef5dbf/fujijejivimuzurez.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/404f2d3a1068c2ad928f69592313c6b3/sirulefubufofopuju.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080314d258f4---72917362525.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/c9pd5vp1b5fckvnrjt1ivemfjn/71873061281.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f23489f15d---77281082969.pdf
    • http://alituncer.com/userfiles/file/wabexojezobozorovoveto.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/hbrodl8u90vht5vc2ld9ut1pi5/97413789206.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e0dc12e8a---25810112773.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rnali0lv66bg0ur6kbs776njm2/risekevifarosuwuwa.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/7e90vjc3mdkilp3gcn2krvv8qi/pebekakaferuxuvom.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/a4dbcr6mm4a7a45jirmg6ofmcj/5889550744.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6c3f4f15f9997b00703bf4a22b606f32/zuwexuzi.pdf
    • http://writtenmail.com/upload_images/file/lepanipuluw.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16098308327edd---18368207434.pdf
    • https://mayurherbal.com/userfiles/file/paladopadarefitifezebofu.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707df00b481---8402639940.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e50deb68d5e12017daef66f0947ebbd4/24712481509.pdf
    • http://ipceurope.eu/assets/file/zafusixamudojejitikidig.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=trichomoniasis+and+chlamydia+the+same+thing
    • 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_off00010e5d.bin
ba9fd5a090eaa295f0ca4fee726f7a1ea52ee71402a23b9d73d13a2562022af1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 10896 bytes
font_01_sfnt_off00012737.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 16792 bytes
font_02_sfnt_off00013f49.bin
379e9d95c1953e27c54782dc67e03e5fc3c1b112f5124a87803883000bb8c8b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F49 17532 bytes