Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a7162f06c176e6…

MALICIOUS

PDF

86.2 KB Created: 2021-07-15 18:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9683b1bcdccb3c73663952d80ee52db3 SHA-1: b77cc2757e615ee67a76704b54aba42b25a31421 SHA-256: 93a7162f06c176e64e4b86ab43823acf7b8044e97f1680b97d715015675814f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution campaign. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a likely intent to redirect users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://catamma.ru/uplcv?utm_term=paulo+freire+the+banking+concept+of+education+citation PDF link annotation
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a08789da---73500366180.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/7604598910.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/7ip2debcrjgsvud1nitc7io7v6/welilivorudoz.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/83a3751a8ad114f70bcbcbc3c5ae5aa1/goxigewi.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210623190432397198rzntlsjjh9hu.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/54787709140.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16080f4d426d5b---telosolu.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f33eab3ab1---pudalagodurupusozixezedi.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/revofewujagamaw.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cae6c1739db5419abb25262b1d2d2c16/66346437493.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/42397722603.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/79eeddbb2f1796a282f3df790a901a96/21921635356.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed969d5a684---3436920128.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c0dedaaffce72a86301079aa64d99a9b/jedajajegunarag.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/91540306272.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608029273c795---xexof.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/401a7a96a109e600ee397cf4edf9d5ce/wenujopepopukogumovep.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160784e0fd1915---tipagewofeze.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608959ef82b76---72964307185.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/g5ti6aor4q75g21gpv6gij7c01/risevifudabinironubi.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf3b1d7cc---4415742835.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/tazifeferufovezuf.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_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 11064 bytes
SHA-256: b72eaa7281433b20f9b05deee279eba5acd5dda3825705a8ecfde0d6ce81089b
font_02_sfnt_off00012060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12060 17024 bytes
SHA-256: 60df3b4024bd47fea86d562e8bf8f38af3a0f7ab4e6187c9e176c103b5082711