Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8c38ef4e1e1dd2…

MALICIOUS

PDF

77.9 KB Created: 2021-08-29 00:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8363854078a7c0dc1059d33b957706f7 SHA-1: a2f45bd583a04b45ce6ce8e6d4e1686544fc3908 SHA-256: ad8c38ef4e1e1dd2b892e5b9674d85289451132efdb1a9a86e7d926b4a9bfff7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which host other PDFs. The presence of compromised CMS upload links suggests a pattern of distributing malicious content through vulnerable websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/cc02db5133055a05231aa9a6261e4709/kataripotabisuxuj.pdf In PDF document text
    • http://tinhdaurosa.com/Images_upload/files/xekabibiza.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/c53adadj15pkeij5gmioumg1u5/jekapegazoregi.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeba4fe1bc3---vamufutakuv.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c7156174d---kamotofarubisid.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/h73ca5libec2ul47q0tjtt204e/21014884681.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec87f7c013---dumagufawusifu.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f6afa7498b8aa50d9a3aaebc6b22f749/bolaponalunesuvepeluma.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/ritata.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/94001728614.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/votogelaz.pdfIn PDF document text
    • http://aweibel.com/Photo/file/82275716769.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ik13cgqru6hi459dind4emc5q1/lutovarijububapewefibu.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/4427324431.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/latojeri.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2f68ccbee8564094d7cffaabe61fea29/renosowajesonage.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/pebnuv1jomhql9p9jbp6hd8keo/44522649725.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/namiwomeziwumopimebude.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/sumuvujus.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac28238726---betumuseneson.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cipet+entrance+exam+question+papers+with+answersPDF 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_off0000caae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 17400 bytes
SHA-256: 33b20bf1864dcc3c5dd903eca9a94a8993d672593e5a6a06c2d118532915b768
font_02_sfnt_off00010ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFA 11056 bytes
SHA-256: f2a8a9c9270197c43156182d6a3b3758b76aee12fa1584fff492875f8007db3f

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