Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cfbd5b264975ce0…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 00:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2de78f35a530f1cea19a2e01cb7cd61f SHA-1: aa9a5c31c0a4afc938c83e1593b067fb543dac6a SHA-256: 5cfbd5b264975ce0a1df142a9ec5e127075c818b879c616ea02f2bfbf6677d5d
216 Risk Score

Malware Insights

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

The file is a PDF that contains multiple external URIs and links to potentially compromised websites, indicating an attempt to redirect the user to malicious content. Heuristics suggest it acts as a lure for QR code scanning or a password-protected archive, a common tactic to bypass security controls. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://inwebjor.ru/uplcv?utm_term=scan+any+qr+code PDF link annotation
    • https://bellcera.60km.com/upload/files/54243312436.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/28127172981.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/kofokavajenetijiv.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/60467429635.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/cc631c7e6c226abcfdc6bddd53ad687d/gipisugamexegobujipunodo.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/40431948656.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/80879619376.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/dokoxotanonat.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/bapikumajis.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/gijomugajirukopogatafano.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/rowematuvejegoxituv.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lotamejidujitofurelenuje.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/mibogirisefominomutajav.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/jozakuzozoremobajateneg.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/42304319878.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/3m6frlsba91kim6t8cs14qbssv7pb7a2/fujaseru.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0g379vkp9b414nokuh0ecnlksg/kagiduvonajawi.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109182100524200.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/sanoraxe.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/96149823661.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090723054873499.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109111117336798.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/59162637326.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/mepefiseverelupatupefi.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/42942599496.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/73132460025.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_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 17524 bytes
SHA-256: b805fbd9fb21d4a6543639a989319c367cb36c226a214673922d474f025adbc9
font_02_sfnt_off00011b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 10296 bytes
SHA-256: 7203d229422b1d46125ba52086394bd62e7d58c3f7853cc860b0454e0f2075e3

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