Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5334f262c1ff52e…

MALICIOUS

PDF

76.1 KB Created: 2021-09-22 13:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39e7fdeac006e247c5c7d48fd815da96 SHA-1: 217616228d2436945776fa048118f87fe6fbc38c SHA-256: a5334f262c1ff52ebc3f8277966d4f527cc8f796b30c243e694c9474e2f29d68
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=dragon+raja+mod+apk+unlimited+money
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161327d9296ba7---25242829648.pdf
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/nilavamudugax.pdf
    • https://ewt.cz/res/file/37159270912.pdf
    • http://ppfi-online.com/userfiles/file/desegopufutu.pdf
    • http://asremajazi.com/uploads/files/60056225345.pdf
    • http://drprdesaihospital.com/uploads/26779712709.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/pebuvamavobagakilutakat.pdf
    • http://elosc.com/upFile/file///ITX202109170454139020.pdf
    • http://fge-service.com/userfiles/file/28544551707.pdf
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/bupitolupup.pdf
    • http://avatars.ru/userfiles/file/lelomijigasusiw.pdf
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/tamopefuwenuxofunu.pdf
    • http://estatepie.com/files/userfiles/file/vakubidovabaxetudu.pdf
    • http://frutapac.com/ckfinder/userfiles/files/sesuxavonuwinarik.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16146cbedce2ce---padetarikemos.pdf
    • http://1day2night.com/UserFiles/file/43050034357.pdf
    • https://balticstroy.com/uploads/files/20712532883.pdf
    • http://adaviestransportltd.com/userfiles/file/82163058037.pdf
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/30524859093.pdf
    • http://goldcoil.com/uploadfiles/files/mizelagimezupopefijur.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8e55d23a2---gujano.pdf
    • http://elektrostroy.kz/ckfinder/userfiles/files/vajemiduwobo.pdf
    • http://sallytour.com/FileData/ckfinder/files/20210909_A2C09C01EC5F6C96.pdf
    • 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_off0000c657.bin
1505a9e7412618d7f2f792242f4228a6099e969301981b6e57f3dde911316aa1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC657 11004 bytes
font_01_sfnt_off0000dfa7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 16792 bytes
font_02_sfnt_off0000f7b9.bin
45daa560175a82c9565b37f9a7b314fbbf1727c67c481f4690c3192c50e35802
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 16680 bytes