Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8383bba22e5b51…

MALICIOUS

PDF

83.7 KB Created: 2021-09-23 06:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f554849957da77550f32dbb5bd837a8 SHA-1: 83256502710d14f94c208d633eb821fbc966987d SHA-256: fa8383bba22e5b515ba318f0a52044605c425e4417d467c04028a46593b3b03d
184 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The presence of a visual download button and callback lure heuristics further support a phishing or scam-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=half+girlfriend+full+movie+download+filmywap+com
    • http://mingmitrcoffee.com/user_img/files/61281277213.pdf
    • https://gegeny.hu/uploads/file/8895532070.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/zoruberakilel.pdf
    • https://beta.nhatthiengroup.com/files/uploaded/files/jexivuxodivim.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613291421126a---43405632303.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf4c20b13---sipasev.pdf
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/xigulosimivopewos.pdf
    • http://nanumed.ro/uploads/files/10772895780.pdf
    • http://clingac.es/d/files/89674084529.pdf
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/15698459767.pdf
    • https://hijaustabilo.com/contents/files/70231633934.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/47632617803.pdf
    • https://korvioinfotech.com/ckfinder/userfiles/files/96795727647.pdf
    • http://chemonova.com/FCKeditor/file/17310041257.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374a8d639e6---71962942882.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/55185826827.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/luvabakiwezojinujotimoji.pdf
    • http://debseven.net/UserFiles/File/kudugijixekarufuxeza.pdf
    • http://kunmobile.vn/files/uploaded/20210921/file/86899060557.pdf
    • http://nhadeptannguyen.com/uploads/files/32966338475.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/belupe.pdf
    • https://istanajp.net/contents/files/90536333534.pdf
    • https://edgecs.com/documents/kenod.pdf
    • http://turnyras.lt/Files/file/vurudesapemonusupuzisude.pdf
    • http://residencelesaline.it/userfiles/files/zakatogezamigosajuvulu.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_off0000e1f4.bin
7b5d489089c9062d3a334fbc1c32fbfc25f71f5b214456c603bd54ed2854c32c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 17692 bytes
font_01_sfnt_off00010f37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 16792 bytes
font_02_sfnt_off0001274e.bin
ee8e624f61746d4a9f045ee84eac7190c6d9459b5af5c74daac1f09965cec951
pdf-font-stream PDF embedded font (sfnt) at offset 0x1274E 11056 bytes