Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bdc440f6bb78688…

MALICIOUS

PDF

118.7 KB Created: 2021-07-21 02:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a9bced1f25fce4cf3c0bb72d1db49c7a SHA-1: 0dcc9b794ada0f93a46225a52588dc13ed25105e SHA-256: 2bdc440f6bb78688b9d207ad505f9ab737803c7c125d87f31ece18305d0dfd6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The presence of embedded PDF objects and external URI references points towards techniques used to deliver malicious content or redirect users to attacker-controlled infrastructure.

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 https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/dec0951325f9482513160a26d46005e3/lijukoxuduvutaxasafap.pdf In PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/2vdk6rk0iq24r0q273f550hgm6/35608666851.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607683ce63044---diserajonerudopoxepos.pdfIn PDF document text
    • http://jucal.es/images/file/muvisip.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1cedd6e3---bivosedadenevexukixavipur.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/4teu41bt93ev8o8i7bh6mvh11c/liliwawozosisudufagas.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b459a28b96---52079658111.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e4f11c192d0d8d11012f4a30c0684a2b/46742471701.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ed6168b31420f920f686fb57c6bb5d2f/texaku.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20217591201155.pdfIn PDF document text
    • https://paradigma.bg/uf/file/89297244758.pdfIn PDF document text
    • http://snsi.jp/image/news_file/70629269152.pdfIn PDF document text
    • https://alutat.com/data/file/fenomudosagu.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/3c9c50d8eb704508e8af5b2da4760e0d/jijaganoponunanes.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/utht4sfcc64u5vn05fk28qi056/potexeveje.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/vibepuribaxijudaseruromuf.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/72059522882.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210708_011851.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6deb52684---bajuwuwe.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770488928eb---daxanokukokek.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078b493c7859---ledegapewu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/23n7e42r781uamjets0s5dr5cr/wuwivaremerutevewixomobol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=inner+conscience+meaningPDF 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_off000170c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C5 10380 bytes
SHA-256: fa884755bc31049636874834436c5d81c0f7bc376e83316b2ab02f1d9b52d513
font_01_sfnt_off00018838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18838 17260 bytes
SHA-256: bd81e228e6dbb3af680b4e45fda73c451ae4e2f3d68015e4f917482e0dd5bc09
font_02_sfnt_off0001b40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B40E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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