Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f41e6a2afd0f219…

MALICIOUS

PDF

93.4 KB Created: 2021-08-09 10:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b0ea872b5b3db77f359eb3f73fb6f74 SHA-1: 86d8d8e4bfa2ea508b74be0c4d4006b5f7b61a7a SHA-256: 0f41e6a2afd0f219d7eb73d4c82711d9fec82e124a885cbacdaa300a6765c681
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed for SEO manipulation or to host malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://condicionamentofisico.com/arquivos/file/67801968507.pdf In PDF document text
    • http://espacioschillout.es/images/admin/file/84688375402.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f75e816283---lolozerexepifir.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/fuwetubagap.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/dcc901f854075ae446a6b48fefb60384/nefowazugugalevevig.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/sutimerizupivo.pdfIn PDF document text
    • https://luminex.pl/upload/file/vavawazikixap.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160939ed16a0ae---sofewobatixuka.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/75025776081.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/56232952458.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/46921163879.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/semevikowedusofinode.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607948ef89763---pezasomirawan.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/wugov.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/22/zewobudujenolox.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94eea34f9---3893174709.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a9decd83d33e8ed837fd50411aab6d67/2785984203.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/tl09tmn9mibn71uhjfeq779lf7/lukados.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/xexekogujuginoxekafa.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/92838efc1051f4d04c756fb822eaa996/pijevixilekexabagen.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/bewakag.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ern163mvurcknpk71qn5que8a1/45598554025.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5683f3195---safevi.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e58117fd67---86945852860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=swingline+optima+45+electric+stapler+repair+manualPDF 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_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 11192 bytes
SHA-256: 53fe39fea250430e06a805ba0c17e2fbb652203063fe5a727800b5e331075d93
font_01_sfnt_off00011620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11620 23612 bytes
SHA-256: 7f5ec4b523fac16b13832b5c26e8d677cc6404c20ae6166b981bbfaff69666ef
font_02_sfnt_off00014e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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