Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bcd3dfb7e1c877…

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 00:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d7a4f4e3f3ec176708c3b05897c8291c SHA-1: 80362894ee7bdabca768c76e1e3e027e3517bc6e SHA-256: 13bcd3dfb7e1c877341f48788231e378efd65b38b458e0f0b594e2d591e43a94
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. ClamAV and an ML classifier identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of numerous links suggests an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://villaelen.it/userfiles/files/dowuxodisiverumisir.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab178584a---kosimodosamoz.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16129c7227aeaa---susoxerebuvarorinalizidif.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/vonimebapipapiviralixejo.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/14932959563.pdfIn PDF document text
    • https://tigapilar.com/upload/files/benojaliwesil.pdfIn PDF document text
    • https://bio86.net/fichiers/gevorofegime.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082330602591---91340672883.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/wikadebonalagogusaxanevel.pdfIn PDF document text
    • http://armanetti.com/images/bivupifuj.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611941110498a---dojarukepefapibis.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2946c7a1f3b67772770adb8fd21b660e/96428186811.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/dipolenubunetaretugutada.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/99625765561.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/51de76a16d64532722d0dbad194e9995/65127983873.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b14cd5c9a---tireku.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bac07886cb---mekowijufisakiwatuzezow.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/53640263247.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e6aec24fea9aafab3e83426998dc41cb/50224501206.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/28941863207.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/74152405755.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55aaa12a3---ribusivijiporewazotov.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adea6b28dcb---farenuwod.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/rawotanezalidegawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=un+peque%C3%B1o+favor+darcey+bell+pdf+gratisPDF link annotation
    • 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_off0000b462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC79 11572 bytes
SHA-256: 61dbb0a5706a4938a818afdf0a6f7509f1c5e598b36f43e1a437e8215393ed85
font_02_sfnt_off0000e71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 17392 bytes
SHA-256: 6f44d24fecac27b8478905901e97d1ea7bdba30c3ff61d296d2c8467c37da300

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