Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6d3f52f5945b31…

MALICIOUS

PDF

68.3 KB Created: 2021-09-13 04:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7207d825b07b83d197fc942da1e5b1f2 SHA-1: d15d4640632040ea7653c246d7beadb3019125d4 SHA-256: fb6d3f52f5945b312a6d25b58cfb1f6459c665ea77473eb15b7cb3b464fb72ed
176 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URIs and a link farm heuristic indicates a strong likelihood of this document being used to distribute further malware or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ebd.su/UFD/7623/files/81419278219.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2a59577a21741ebde1e402a5e18fdce6/jinanokiba.pdf
    • https://linhquan-group.com/upload/ck/files/53569626312.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9d3ddc4921a40761e5c5af992db38cc0/fezeguximamopiguwixibo.pdf
    • http://colokit.thienlonggroup.com/Images_upload/files/40415317700.pdf
    • http://consade.com/userfiles/file/wivekavu.pdf
    • http://assytekservizi.com/userfiles/files/buvigitasul.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5cb19a84da5cccd0b3c0eaa7ac68c027/tujafofuzexob.pdf
    • http://furniture83.com/upload/files/pezowisivivijo.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/sebixujepawub.pdf
    • http://automsystem.com/UploadFile/file/20210913062454287.pdf
    • http://akvatoria.by/UserFiles/files/nagisekojovopidoruwa.pdf
    • http://teresachild.com/upload/files/jexejapowerogof.pdf
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/livuxazulobire.pdf
    • http://ylpqzl.com/ckfinder/userfiles/files/dotavejanawuk.pdf
    • https://anakmeong.com/contents/files/1584348770.pdf
    • https://beautifulhairstore.com/upload/files/gatixaninezazisafotilujin.pdf
    • https://bfull.ru/uploads/files/43805187415.pdf
    • http://beloezoloto.ru/userfiles/file/gifofizazojinubav.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3f354b8b4---difabuju.pdf
    • http://chongthamnguoc.vn/img/files/45774019458.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+download+hitman+2+for+android
    • 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_off0000af46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF46 16792 bytes
font_01_sfnt_off0000c75d.bin
1eee7b1fa88010a6614945f7934a1337bfc5a6b31d3d4a1fbea273188696826f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC75D 10632 bytes
font_02_sfnt_off0000df86.bin
5fde33f8353c920eb4a8e320774fa0f607b78f5c17fd1d036dbb5e2d9c47ea50
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 14476 bytes