Malicious PDF — malware analysis report

Static analysis result for SHA-256 2004a03c7f28f6e0…

MALICIOUS

PDF

78.7 KB Created: 2021-06-29 09:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70bb01971cacd92b7157776e99d377ac SHA-1: 3e82f6a9f1ad93c9b3fbe51069d5498065be242d SHA-256: 2004a03c7f28f6e020213112a58656d3d1cbc295dd42e528409e5a78aafaf748
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=as+is+form+free
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/83817524675.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc729abed0a70ee961f86a2ae89d39d7/45529400198.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac60139dd---72067219978.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7e17ac47c---50500139097.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160d9245227374---81066067500.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/6marm608lhvpvnsvj95ib6b8cm/6120175153.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/fa4f7ddb4a17e9239407d7d02ba0f938/24057340577.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16071e42944be5---11053411332.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f553b10149---luzeja.pdf
    • https://hospvetcentral.pt/site/upload/file/94779272991.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089be0341944---naporikajotajaxeji.pdf
    • http://tehnicgaz.eu/files/file/31214425681.pdf
    • https://gamepinleri.com/calisma2/files/uploads/19216920377.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed15feab1c---14028014064.pdf
    • http://shortguycentral.com/ck_uploads/files/pavifarefepuzifige.pdf
    • http://1utilaje.ro/mm/file/85791403210.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d63174634a6---58152587271.pdf
    • http://banghetretunhien.com/media/ftp/file/xadukuwiperefilela.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a5be71b61---22566584229.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd15b41fe39---zezidowifez.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/552b535d7cd513f820181708fc8fcd5e/satuvodejitofi.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080e8a140ab9---97803593940.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c06faa2bb1d---23439537914.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210507142604.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/34d77a206565799003a7cdc840e8ac1f/8957017640.pdf
    • https://asthasupermarket.com/userfiles/file/25062503206.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_off0000d65c.bin
63407237ef2b2d1b4c7e91bab9dffa300088b6ae8d49b73ff18a2598e968c9a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 16008 bytes
font_01_sfnt_off0000ffb2.bin
e2d6eaa5e152e79e5156214c3673c056869992ef9c7b611f4663b4346a21794c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 9948 bytes
font_02_sfnt_off000115b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B5 16792 bytes