Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb1643b48c96ecd…

MALICIOUS

PDF

102.1 KB Created: 2021-06-23 05:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cdd9fcd6e9f28a4cd241bc497c6e00bd SHA-1: 48fa2c5f69437151fffd96dbf4484436e80297f4 SHA-256: cbb1643b48c96ecd710c84a989ded8a7a32149b665a4a56b3c543f128bc95b3f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites. The document body is heavily obfuscated and contains no discernible user-facing content, further suggesting a malicious purpose rather than legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b70b50287e52bd594c8fa3b588b8d9ee/varujaxebaregegapabaxe.pdf In PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f13df8ccd1279a107ce43429d0b7c7ad/94122028313.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086655ebcbdd---50211924407.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b1e368267018d8b5bfe449f4a957a978/70739946463.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1caf5614a---mavaxuripu.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b62416065f9bfbf8185cb9998381edce/bamixuxug.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1b128825ca09f48d5b85eb2ba88f0f2c/wasumiw.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbffac3d4b---xofave.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/dimonoxadutiwajefiferosa.pdfIn PDF document text
    • https://seripin.com/calisma2/files/uploads/138217252.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/utv99s7s7f03gdeemf99207t07/46886192576.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/36faeea24ac412461f76373904e9fca9/pawad.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b242149335---sivomakikifikovomo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160828e45af6c9---kikasuketa.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089e735144e5---78971759781.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/10e36eaeaf19744c8010fb7391005d00/35998268238.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=modern+thermodynamics+with+statistical+mechanicsPDF 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://scripts.sil.org/OFLIn 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_off000125dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 5168 bytes
SHA-256: f8e652e91f4c4c3372ac522060ace1639fc12faf15fceb68d9b91c35c9a7265f
font_01_sfnt_off0001374f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374F 14108 bytes
SHA-256: cdba51169d18c57ff6828943306b543da3d20ecd90ed7fdf6a620f6fb4966d47
font_02_sfnt_off00016629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16629 16496 bytes
SHA-256: 8e1e83e9bde12116263ff294a962d01b53b52ff26304a7730b73d6c138f419c4
font_03_sfnt_off00017cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CC0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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