Malicious PDF — malware analysis report

Static analysis result for SHA-256 988b53675d462f7c…

MALICIOUS

PDF

75.4 KB Created: 2021-09-09 16:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26041c836478f38643379687eadc73e3 SHA-1: 0c05a08c1568af7922e4ad78019d7886b84c6ee6 SHA-256: 988b53675d462f7c99e42bfadcb77ea11d584e32a584b7889ede546750811b9f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting. The document body is unreadable, but the presence of numerous links to potentially malicious sites strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://rulife.ru/ckfinder/userfiles/files/76008365081.pdf
    • http://acrgroup.nl/userfiles/file/7814546191.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/31222779063.pdf
    • http://szjwwj.com/userfiles/file///zejuj.pdf
    • http://abwingscolley.com/uploads/files/jeperile.pdf
    • http://maskaevlawyer.ru/userfiles/file/60247994664.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/127a30e8c4a818020b536a52eff73676/34710679013.pdf
    • http://yjccnc.com/upload/files/27547548853.pdf
    • http://honyi.tw/ckfinder/userfiles/file/kemixuzonikatipi.pdf
    • http://ebd.su/UFD/7623/files/17622818454.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8aa2d786e8721c86435e740808abd8d6/zafabudo.pdf
    • http://www.wiz-fac.com/uploadImg/file/34396473231.pdf
    • http://evolutionchonburi.com/userfiles/files/45097800859.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3b13656ad2aaece76ca728925462fc75/wibudumoxizapepazapuwogu.pdf
    • https://martabaktelor.com/contents/files/16482433677.pdf
    • https://www.oalysa.cz/ckfinder/userfiles/files/golobidatekita.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16133339d24585---81276413570.pdf
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/94974304943.pdf
    • http://vetportonaccio.it/userfiles/files/87477345552.pdf
    • http://ahkkpcm.org/userfiles/mejabune.pdf
    • https://efsanepin.com/calisma2/files/uploads/30867873084.pdf
    • http://bigbazar.cz/is/images/FCKeditor/File/zupuzetag.pdf
    • http://terezmisszio.eu/files/file/gerezezibobukugudanaj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=null+object+reference+android+studio
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbff.bin
c653b4e0994cd2be3c64c0b823fc0461a3f274ed9b8c5a73a8fa0cbb11834a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFF 19700 bytes
font_01_sfnt_off0000eef5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 16792 bytes
font_02_sfnt_off0001070c.bin
2c1327cb5438fcc8aa02e3681966f661528d243e99ba2da35259ed8cad6750ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 10816 bytes

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