Malicious PDF — malware analysis report

Static analysis result for SHA-256 2315f652db66fcce…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 17:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba566b63721937b4bc1f45c11643f086 SHA-1: f37e299a6ab29cfed243b21ae353a4ba32f7f745 SHA-256: 2315f652db66fcce699d3a7660c04d9027998eeb03a3abecdb5e3eca9625602c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://synerhu.ru/uplcv?utm_term=room+planner+for+android PDF link annotation
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613548fe66f7b---susimizefovoxikudomegare.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/tolelasanobezi.pdfIn PDF document text
    • http://pferdplus.at/sites/pferdplus.at/files/file/16083946981.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/61778680147.pdfIn PDF document text
    • https://reniuved.it/file/33569155878.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304195a4fab---77254277743.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/wowebugowevogamosudipime.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8bd817527---71305636849.pdfIn PDF document text
    • http://fruitvita.com/files/files/luxufadamadawojiregezu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f23011c9905ec611654e541e49ece944/49231076108.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/wupizizunu.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/23653194768.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/28991970338.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/zifekafejewuloguzizujafif.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/80318348290.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/vuzizoti.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/kaditokevixebox.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/rifavajupekuwebidewiban.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/fojavilifisax.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/dizifikubebirutubawij.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/32309939070.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5C 16336 bytes
SHA-256: 37fa009baa434e56c9d0f8ca1702f29491c8feadf2083bd43354ef44a2d54d92
font_01_sfnt_off0000c5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B0 19260 bytes
SHA-256: b7200cda62cc197098c2b08232d7e80b3d87f88bb04c6cfac428fd820aa53da2
font_02_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 10440 bytes
SHA-256: 9759c82026de0df95a8f3ef921f40201d95c82d9d206d7b836b68ff5bd6c0971