Malicious PDF — malware analysis report

Static analysis result for SHA-256 db34a3cc5ce755df…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 09:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 478020e4c0ec379b5bc5e05f91a9965e SHA-1: b62bcc9084de7d41ddc521ac95ab8c6fe40026ec SHA-256: db34a3cc5ce755df2cdc8191cd31d5044561817bb4ef219ad632d3153161ece4
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely to trick users into downloading further malware through the provided links, disguised as a game hack. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=carrom+pool+hacked+version PDF link annotation
    • https://sharmtocairo.com/userfiles/files/vamanawegimetiw.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/45373827575.pdfIn PDF document text
    • https://tsegypt.com/file/tixowurukagunutoper.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/dudoneluwanunanipemilek.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/73340578243.pdfIn PDF document text
    • http://specialcats.nl/media/files/mifuvoxusu.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/82672012974.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/nonel.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/wigovasubojonemagigukul.pdfIn PDF document text
    • https://papiratisk.cz/soubory/fotanuvetewapofok.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/bolifabaluvutugadisimup.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/33642709170.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/sedafufeziperudexaxaba.pdfIn PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/33497660119.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/jagogidofap.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7tugmc9rg9jlgelsk6uq6d9082/65121079253.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/24552527925.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/25955585222.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/ripefulum.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/84232167568.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4c9dd9396---97496396246.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/zaresusojilewenetilax.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a134ec5db49a643bb759871cf8ba8b4/foxikamikewugodenorali.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_off0000c0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F9 10872 bytes
SHA-256: 1516e1b81b405715c68d8230460548e11984fbff8c170ae1f3482af928568171
font_01_sfnt_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 16280 bytes
SHA-256: 9d6d7d4b099a36d8b8684fdac79bb281053d8f4bdda2785f8e555965dcbd1cbe