Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1cc4aa64fbe05e1…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 12:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c0b7b6e560fbb3c3f358eea335b173b SHA-1: 3866d0b070b351dcb35bc10996cdd6e9ae7b1389 SHA-256: e1cc4aa64fbe05e1c54292510e1fdae294babfe196141c764f6439c2c346619f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest potential exploitation or redirection mechanisms.

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 https://pistant.ru/uplcv?utm_term=best+football+manager+games+for+android
    • https://eirai.org/editor/ckfinder/userfiles/files/96542798955.pdf
    • http://rideabikenews.com/user_img/files/68268983486.pdf
    • http://assotechne.eu/userfiles/files/pozukubaganetisivekatonid.pdf
    • http://exmar.it/foto_fck/file/mofolovejumesogir.pdf
    • https://aymexco.eu/ckfinder/userfiles/files/wokadifuwof.pdf
    • http://pjteam.hu/uploads/levidil.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/bugigukalunoxezeb.pdf
    • https://lawrenceyezersky.com/userfiles/file/loxelokaxixetal.pdf
    • http://russkiivopros.com/images/FCKeditor/file/zusajuxele.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c33e4555c---mimelozamoxuzedizamu.pdf
    • http://mobilesamara.com/img/files/file/vuvizekolotugokusobuban.pdf
    • http://hani-bee.com/userfiles/files/vozatubavonakisewoxedab.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614161a455d3e---26239900888.pdf
    • https://giriconsultancy.com/content_files/files/gevibugisitilazejojope.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c5077a8d234da418d3c95c994e872578/59589684698.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/nifefoxixapuxoke.pdf
    • http://baoveantam.org/upload/files/78357712578.pdf
    • http://stolizstekla.ru/userfiles/file/meresuvirexope.pdf
    • http://cc-loges.com/uploads/file/84627119646.pdf
    • https://abzesolar.com/uploads/files/zunesexesipapuxilepita.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/dusabunesupafelisam.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e58797613---10879757290.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/p97u63fmktrkn0l8ng4hj0orbu/soxutoxosodibosem.pdf
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/38048555662.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_off0000dcc1.bin
18cc32701c13233d22f92a8d6e56611686205ca783f2bd636b5d00b487d38c53
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 10888 bytes
font_01_sfnt_off0000f5b8.bin
604070ef3aa2d4f992cb35abfcd76a851a3785866fff06db8569002c925cb648
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 16236 bytes
font_02_sfnt_off00011f62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 16792 bytes