Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3fb5c5453e37c3…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 00:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e7955eaf637d700b226408902a48faa SHA-1: 28d82eb1bfc8a5591090947adb05f71cb270b269 SHA-256: ed3fb5c5453e37c308212af0532cf70df9662499a19b41a9801382008683860d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute phishing content or malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://2m-m.eu/userfiles/files/72997216673.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4d14f579001bbded5b6281260692baa3/99743479087.pdf
    • http://tdjl.com/uploadfile/file///2021081616461859.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16091aa5f10eed---vitelanirurenudewil.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d233feb836f---tanozefavanufojefewav.pdf
    • http://ghettaetamionarchitetti.it/userfiles/files/86784285687.pdf
    • https://groupunsur2.com/contents//files/30613337797.pdf
    • http://sergeybazarov.ru/file/kuxepapopop.pdf
    • https://www.institutvzdelavani.cz/files/62285142870.pdf
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/72445678181.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/ponuriso.pdf
    • http://www.cddfct.com/up_files/file/81255977818.pdf
    • http://angelescare.com/userfiles/file/vaferujidutigexajoton.pdf
    • https://afra24.com/basefile/afra24/files/gorabonukupopawigidevola.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090ffe81ddc8---86808393109.pdf
    • https://edusfera.pl/upload/file/38471515255.pdf
    • http://lnimeina.it/userfiles/files/xiduxerisufi.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64a9d393cc---lowaparamizibebizojifur.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd377b440---lozudofuxapem.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/b169427598b67ceee1546a1d03f6ac50/zativofujodupesulosifif.pdf
    • https://accuratesearch.com/userfiles/file/tijodasexufawikexagi.pdf
    • http://asbufestival.com/uploads/FCK_files/file/48982077033.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2ad905892---33354232084.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c539ee4de49---rowese.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/xafelegalitarebok.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=psc+clerkship+2019+syllabus+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_off0000daf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 16792 bytes
font_01_sfnt_off0000f30e.bin
df9b53875a587596cca34ec2b908fd3698f2445b7e7416d1eed82ac43668d92c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 11304 bytes
font_02_sfnt_off00010d9d.bin
48ffe9cf6ef14490e9e220763fcce666c9652346cc58bb6a1c2c5352e22d5724
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9D 20128 bytes