Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba81ad65c90a23c8…

MALICIOUS

PDF

87.0 KB Created: 2021-08-07 18:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 914932bdbb4784e1932e5db5efbaa5e3 SHA-1: 878fb36c7724cd37b37e1e5d10b4e83a62ee1d1a SHA-256: ba81ad65c90a23c80b059a9f3f9569233d70c25b167bdd56ad9791fc1e2fb8ac
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The document's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=epson+adjustment+program+free+download+full+version+l210 PDF link annotation
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f90ee74fd12---rogivilemununepexoxosokap.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1458bbc15---52788711085.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/vazunot.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/23253648729.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/24412685264.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/54764210201.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/27a1re5r1l9smo7nbh75vkqog4/52839767587.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/16b8864b0669b901f9f45d09c7134a6a/32372234332.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/61291820421.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092c2f882ef9---devazogenipagemogedav.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210731133801194.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c286f18c90bba4699bc924294ee2b7b/zilirosa.pdfIn PDF document text
    • http://juentai.com/userfiles/files/bukenolalupijidawisipono.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/44481768991.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16f3b9b1d4---39330391917.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/rufukisivupo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/io79v1n44vkv1c9a7rvg37g3aj/3848273993.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/kepuvezetidimorajesibe.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/gininodulememes.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/zijajevagema.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/ligudebuniruporap.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/1267d447ea811e6ca795c75740ea9457/7353759729.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/mafuvigefemabutatitaf.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfbec25d86---zebisobupape.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/94826513588.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_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 16860 bytes
SHA-256: f736a4b510970fd2155ed53ab21ff0947ec2137171875e5d160aad68e6903ee4
font_01_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13037 11500 bytes
SHA-256: c13483cc7b5553b1e07f6a7c31ec810a7841fd84b2ccff7e4c0fba0cc9a2cc5d

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