Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bc2714137772db…

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 11:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61662ca9c2170854bf1f092e5214788f SHA-1: e5dee2b7fc52ccc22e44bf323bd8c3877a6e3b76 SHA-256: a4bc2714137772db69c6a4250406ad659e896b19bbd2c6d6b068df5f0d74d7f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs forming a link farm, many pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution lure. The presence of embedded JavaScript, although not directly analyzed for malicious intent, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://allytemp.ru/uplcv?utm_term=only+4g+mode+apk PDF link annotation
    • http://hzqljsj.com/images/upload/File/45641183990.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/tuzope.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/nokijejaruzubesel.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/gukujutivujemuleloven.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/polijejebu.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/difukameguza.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1a8d9bf0b---tuluviferumojoferixagok.pdfIn PDF document text
    • http://home-plast.ru/foto/files/nifujopedejuxisaded.pdfIn PDF document text
    • http://klhl.com/userfiles/file/93198938414.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/dobikuke.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021925827256739.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/mataxijuruzebaxenuxegotin.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/waguda.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/ruwufozagerujiripov.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/8277fb22302d07d9dcd184b4a3594fe7/23443186307.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/23042415089.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/48473298028.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/35369990614.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/5091925051.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145c7490a3c1---5059528932.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/kojedawutilulobaxi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161306aeb46deb---88065750859.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/goxozedi.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/kejofe.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/dowazux.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/70270225416.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/95106883466.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/73567097826.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_off0000b516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB516 17948 bytes
SHA-256: e523470e8db5c1896505adc58a9de6c9925539fde9b9e2ee981cca3540cb8e16
font_01_sfnt_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 10584 bytes
SHA-256: 4d6d8865db7d8c684ea159700d3269b1dd1b4eeb218dfa0aa60597b534d3f32c
font_02_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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