Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b433c33367b410…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 11:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 027acac3f7b26a2e1e7b30d4e6eb361b SHA-1: 205f5a429cbd1c2a92668f308356dd21b8a50154 SHA-256: 05b433c33367b41066b082e8f174048e6a934355dcd9cbd1882fe4bcd92deeee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to manipulate search engine results or phish users. No scripts were extracted, but the overall structure points to a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v6dgmao24kv61p0c79ubjrrnc0/43020684948.pdf In PDF document text
    • http://ktcz.eu/files/files/62964883374.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098424be6f37---19159169339.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/31d34e545294fe1bb37610af82aa81ab/ganumafe.pdfIn PDF document text
    • https://ocw.tw/uploads/files/61488785264.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/9869eaec75a185f648dc2f62de62cff4/simoxoritozukutomut.pdfIn PDF document text
    • https://italvaping.com/file/40827145927.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/65291402780.pdfIn PDF document text
    • http://askort.pl/Upload/file/14645240934.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/73818812318.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/61013104334.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/nininusigofuloted.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/56b898af16af5f6ffbfd8880f1458238/24595713432.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/6692dfaa4e202f075cbbc3b768cb1c2a/36078081658.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/38377650679.pdfIn PDF document text
    • http://quinta.cl/upload/files/vonunazonuwixamabosi.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4a473ea2ea3023f4be72d64c3e9f40aa/4277321053.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/futf7juauqstrbtkfvo9l0k4p3/bipuzepiwakaru.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/137186df93dad3dc1a80cc973bc4f297/20599357554.pdfIn PDF document text
    • http://trieuduong.com/images/Download/pamawukogodovogujuget.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcb755e48c---garupekedabawebupaxefovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=metabolismo+purinas+y+pirimidinas+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/eb826313118d687ddc4c3264617f22d4/molafu.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_off0000d0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CD 11004 bytes
SHA-256: 434ea6aeee6be26a48e2662103c3e221e063fa7c898437b81b5cbe1a23485afb
font_01_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 19400 bytes
SHA-256: 72b012b1e8aa865324f165d8207c4b3500e344bdb501050cae9211be57e25705
font_02_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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