Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aacc66e65bcb3ae…

MALICIOUS

PDF

94.3 KB Created: 2021-07-07 18:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3df16168ee3b9604b64fe32e3f2bf16f SHA-1: 6ff06a254208958df2cdad853aec8f4d49598099 SHA-256: 2aacc66e65bcb3aef9763fd22b85955626b474141d9fead12f0515e4aea7eee0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/2e9eck73jhe340is07fqb87lib/jakadanajunumifosawamiv.pdf In PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/medivepitetinoveloruta.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/60678997641.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/ligugabetirob.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/32906335829.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/31352164154.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/mqq746euf7495560kv60mu3q43/38251022851.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/jm5036r5900oc8sgda98v6tpm2/piwonafera.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/0b003983e6ab6b27a96bf2abb9bbfce3/netof.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a64bf67ab7a---xuwusaroz.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/lhtpa9hii7ioa7n115lgi7jv3h/jewuje.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/wisepodamimujokuroman.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb691013e9b---mugenusokalefi.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9215d090---63482029419.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d400664cd10---megatiguw.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/cdd15015711293610a77462ba766b2b6/podanoves.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/65396026425.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/01213a334f6b4df56b648ffe9d0467b9/76121106832.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/buduboxapadiragunorabiba.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/mabeja.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607300f3af98d---38798824144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=class+9th+maths+ncert+solutions+chapter+2+exercise+2.5PDF 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_off00010949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 17436 bytes
SHA-256: 3297caca1fd5494ca035060f7f7f5f3cbb462433068e7057eb94735688ac0e08
font_01_sfnt_off00013723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13723 11360 bytes
SHA-256: 187600d0ba51ef786d49547cc0ad6bb18c3ffe7c77f40c330661ad7bfea9e1da
font_02_sfnt_off000151d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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