Malicious PDF — malware analysis report

Static analysis result for SHA-256 1377de26f1fad812…

MALICIOUS

PDF

88.2 KB Created: 2021-07-04 16:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75284fa1ecb6fef8a56ff48fc539db0c SHA-1: 9b250614a2a0cb478c51b510d3e19eb6f456e16e SHA-256: 1377de26f1fad812eb7779151e6016317dfdc3f20bad523ba53c56183bed42d6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDFs hosted on compromised websites. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to redirect users to malicious content. The presence of multiple links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/umobth1h1cb097r9g1hvvjlacu/56882336632.pdf In PDF document text
    • https://shen-su.eu/gfx/userfiles/files/18453983902.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210609153601.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/cec8c282f46814c91d7f6f80bf4b0a96/lerexemigepuxupiguj.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/73k5f08t7h78vc5q1vbs5v382i/41635632213.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/tapuzo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/47598781535.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8f2241e5---30017928289.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab12a67109d---57448791581.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/91940116021.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/90940318912.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/weketolikozodosewudej.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160758fef45feb---68098053943.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/58842818254.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/bduvbqu98upd2kvf82milocvom/14035928059.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/iim8fp3j4bdgj3lpsm19ph4n2j/86779605952.pdfIn PDF document text
    • https://birudongker.com/contents//files/sepobabawumim.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/22182733456.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16bb95e2e5---binexubafivub.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/72946548067.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/dumotajozufo.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/watuvepenod.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bec69f468---5921503033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=favorite+activities+for+the+teaching+of+psychology+pdfPDF 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_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 17316 bytes
SHA-256: 31fdef8fe62138e6d27a2018bfb42ad12e70c7e89601c652cb2c019a957edf3a
font_01_sfnt_off00012171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13988 11056 bytes
SHA-256: 2abc348fa7eddca0155ea7acd5b54900650c7be6607cc3ea195914f0632b3ca6

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