Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9ddc826fe3e9ba…

MALICIOUS

PDF

89.4 KB Created: 2021-08-09 20:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 775114ebc3741cd9a9ef9c9cb9737b9a SHA-1: 09763ccf0e6636a0857a062c0743978ae0c6661f SHA-256: eb9ddc826fe3e9ba99593af549b598dc9f3085b9779ea7b5962af35a4cd11800
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The document body is unreadable binary data, suggesting it is not intended for direct user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://buren-kompanie.de/userfiles/files/tufadexabalilekazo.pdf In PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/oh3sbkhvfq138pvh60i4pp3kbd/88402614566.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/n3co6vhsdf6gbcr9hvm7p5euh1/suwefolamukigepoza.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/podatumakawukumezokifonib.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd4592be09---dezerezewabe.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/xefibanonulapa.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/bee34519f0f99d170046bfe8df47237b/72610439604.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1624360166.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/584f735c49c3404c6b8caf9f8f59d522/xorifawesawupuromaf.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a9106969c---wugiwokasugedoda.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/59869309965.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/80d9d1125d0d5aebf3ee66c30ceee26c/tusipisuxujefezo.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/17jj40su4vdrergumh5696np89/12233324254.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609a24bee4051---55863887212.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/974aac2c5c60137a05ae0f1eb206f741/luxawumiluwulodatur.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/42974385748.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/60905534833.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608339471dca5---tejenuwasumevusetojet.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fb8c23112b845b144ec3e8a71410c67c/85009818731.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f56ae6ba60ee3da375b86b6677010863/jimotutezipalila.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c24ec5aec7f7298d114223c8b3538917/99228239335.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/nurorumesenewe.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc9c11408e---xevobojivisigisalevutudow.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e716e999ab---fatixavuk.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb4b6a077f---68460148631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=exercices+droites+parall%C3%A8les+et+perpendiculaires+%C3%A0+imprimerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 11200 bytes
SHA-256: 6a5de9d6d08b087705fffefdfa0f7f35887abcdf11a122a9e9ad230441cfa6d5
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 18236 bytes
SHA-256: 486c8297535918d0088e29b9ef88ff8eef02981f9b4b872226e565ada24e2f5d
font_03_sfnt_off00013c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1A 16384 bytes
SHA-256: 3d674af07487908acf5691c10969220f654ea9c35848d36c914309eec08a2dd0

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