Malicious PDF — malware analysis report

Static analysis result for SHA-256 5593805c9bf9da50…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 17:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33a54ab5af93e56b835b671839984805 SHA-1: 65d676a8e99e05e5ef71c1521ceae640967f3bc2 SHA-256: 5593805c9bf9da5007d40e91fa123eb2fac7a6825330ae461b18cb719eab4ebb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites, which is a common tactic for phishing or distributing further malware. The presence of external URIs and callback lures suggests an attempt to trick users into downloading malicious content or engaging with a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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.
  • 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://philabc.ru/uplcv?utm_term=imo+free+hd+video+calls+and+chat+apk+download PDF link annotation
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300492f255b---xidegod.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/fabavubovuvibezakurusofe.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/dimojupuwe.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/40263498003.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/1426457676.pdfIn PDF document text
    • http://artepcb.com/upload/files/95632593360.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/7818061176.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/bizakojoza.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/vukabagavuvisameguvigob.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/62b598e14c37b02314c6f96a380e5783/miriruwev.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131c8b645dda---sanofa.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/65989273882.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/wiboxil.pdfIn PDF document text
    • https://kapefashion.com/files/files/babiwapibamamevekaku.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614559cd05ac6---rudapavexojegibaligomor.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/80586205714.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/wevege.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16132e292e2d2f---88097843181.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/pefuwatajubowixexurivin.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/54408622553.pdfIn PDF document text
    • http://roocenter.ru/upload/file/zigobotavapototib.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131f78ee9163---temozagagogenopos.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/lifodupo.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/34646241960.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/dekokagubijorab.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 11080 bytes
SHA-256: 70412ab853f8d3f3ed3b8a2a07387c6f4cca8f344993d339210ce374f879d40a
font_01_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 16548 bytes
SHA-256: 54299958be37fd473508d72015272cfb34b45bb2a490da7e0572e82ee4d46947
font_02_sfnt_off00011d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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