Malicious PDF — malware analysis report

Static analysis result for SHA-256 9833df0ae3ea03a0…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 04:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a5158ebcb48e4b3c64b409468168c9a0 SHA-1: 282d27864ed68c783fb8f3ce6de7ed1ed93e5b8b SHA-256: 9833df0ae3ea03a05e619fdbf78cf2564acca07df3859d988f9b5a79478ba8b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect users to phishing sites or download further malware. The PDF structure and the presence of multiple external links suggest an attempt to exploit users through social engineering or by leveraging vulnerabilities in PDF viewers.

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://huntic.ru/uplcv?utm_term=guess+the+movie+name+by+emoji PDF link annotation
    • https://namhunglogistic.vn/site/files/libaritojasiw.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/36b3ee667d9f8a2e85d39cf24cb7cc62/82157354777.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/wexorodupojo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c97de6d6ece---62425457810.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ka0iebsfi27dumhnj9e7mgvgj9/sijixijidow.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/51356934559.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dddb4885b8---tosisijiniligevomiko.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d32a5ddd5---49111536818.pdfIn PDF document text
    • https://synersys.fr/contenu/file/gagiwugawedipopaxe.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/644ae5985efca1a8cf67cba386b95374/52794561345.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a210a4a50843bb0bc7b81e8e0d3a36ef/45001801084.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/48549309577.pdfIn PDF document text
    • https://petek.biz/resimler/files/piwewimulupazuxuzipuleg.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/vunulirakega.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607223cbe8adc---sosukuko.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/hcn7qdt9ub84rbmm6gtbsj5cds/zanemifofij.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608419f477286---retemibuka.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/37902403914.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a829962b795---65242754492.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/radivonegon.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/84373a5076bb830e335d5a24804de4b7/67549641202.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/91254608093.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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 17892 bytes
SHA-256: cbf0b4d91bce64cd10b75f7bb88db009566a0438ab2e54cad71430a56304cdac
font_01_sfnt_off00010ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF6 10816 bytes
SHA-256: bb9e096c3c71462fe7b2379781eebbcf4da7f47809634ca977432016506d4bcc
font_02_sfnt_off000128cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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