Malicious PDF — malware analysis report

Static analysis result for SHA-256 4490cc2104ec7dae…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 19:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 586e1b2a4488c4fe48b815bf9de80706 SHA-1: 32a7721b9ca243a11d6bb54951402a4110055859 SHA-256: 4490cc2104ec7daeea15df5c90eb6eae9ea32d2d3b9e2a6c6ed8319b2eae7060
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute further malicious content. The presence of external URIs and a 'download button' heuristic further supports the malicious intent of luring users to download files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jingkangchem.com/upload/files/weporabo.pdf In PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/58113931496.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/matori.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/zuwatixetiba.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/nozugonidenidimori.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/jefmr814cmemt8rib4r6lk2bp3/87631263127.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/sugevipuwip.pdfIn PDF document text
    • https://diphong.com/uploads/vojom.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ee97d8243---16085479751.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/jawirivimo.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/0214ace049de71bc3f546b4a0575afe0/21835006849.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/70ccvj6srqub4g1of6s8rv68mm/wamojimegijimik.pdfIn PDF document text
    • https://premiersuli.hu/files/files/25514784372.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/75291572235.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/vukepidefuwo.pdfIn PDF document text
    • https://badrivishal.com/media/25158635898.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/40807128100.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/38980608015.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/gevesepazuwu.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/6048860641.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/6184297636.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/60395486785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+free+pubg+pcPDF 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_off0000d9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B9 18324 bytes
SHA-256: a398290ac41943fb218ea032abf7afaa80c58b0061c81e70237145972600e388
font_01_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 10400 bytes
SHA-256: 20374f7b5c41b0b77feeb5b4671132c162c57dd31676546262b2d2d8b65e09c7
font_02_sfnt_off00012114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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