Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b71b96910b2ee9…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 21:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: df8d739e304afdaa5d0fc09c7e1e3cbb SHA-1: 7027e4c3b4822374c814dded63a8ece6928a9371 SHA-256: 35b71b96910b2ee9942d98289b887634d6cb3d986746cb328108a61bd1791c99
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues beyond its structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://larioenergy.net/uploads/file/dagozubebaravijofebavi.pdf In PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/83071159637.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/68068028413.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607137cce8277---jizobetekuxezudakusil.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/35878816425.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b6fc7627---34194172991.pdfIn PDF document text
    • http://erimti.com/userfiles/file/82569079799.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e03019bd6fa4e616248d50c4ef701513/20864541728.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119f89a5143f---gekowevopu.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/19687618433.pdfIn PDF document text
    • https://jotelek.hu/files/file/63339943103.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/37444641803.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/11871267420.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4qsus9qb59hihtbaa0trkcv4k1/96891082915.pdfIn PDF document text
    • https://koratspring.com/upload/file/vugisolekolixiki.pdfIn PDF document text
    • http://aqcons.vn/upload/files/65073211874.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfab7cd8af---88577256231.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/ralosa.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/18197243553.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/74575403086.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/tmeq40i414p32o23u62h41pjs3/65409274773.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ef99b00f---74180120132.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9aad4b9e11e98b1c708b6ff607a7c208/zilifok.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/31072113865.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079440b93ccf---botozubusowosogilesebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=people+get+ready+beckPDF 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_off0000c659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 10672 bytes
SHA-256: 58ea76e7f21cbd5203eea1cf7bfe9fe79cb5edee638e5e01892aaa0a34c06a48
font_02_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 17608 bytes
SHA-256: 4c1ade151d001ba47cd1a459d1b015ef8973cbb1dac73faf3d09c00cf32bcdab

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