Malicious PDF — malware analysis report

Static analysis result for SHA-256 654a82a915db2b0a…

MALICIOUS

PDF

98.8 KB Created: 2021-07-02 23:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ed2619e799aa880b9c84ade12b43ba6 SHA-1: 844295baf1881541363239310983d5d94e084076 SHA-256: 654a82a915db2b0aeb77dae6d33ac09a856bba97d06bbd431a1c905dba7674ff
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, further suggesting a malicious intent rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://atallmed.com/userfiles/files/niwizotajiputodekorukoze.pdf In PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ad19990b8a8796e924e2bce9115308ba/jiboxezunuda.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d174a0d80ab8b3d912c9017d3ef403c7/97908967369.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/af2graoio8vfpko5cic6kv4kj7/zitujaxikuleduvudo.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/92361322593.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/fbe502a6625a668d88fd3e6af85ced68/77147947591.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/37bb79b597c73473f07f3b2f4c802d3b/tojib.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba27d853113---86764990761.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce102778ff---lejakakijapofuvejakulu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b827dc4aa08---60677166090.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/300d372ab6ddfb7235a536025912ff0f/78372688518.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/pusefuzelirudutinugemi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3285c415a1---49213396929.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c857f2aa---gegubifimuzojiluvizum.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c47fb27fa---lesivojaxago.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/89455367291.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/kosujuxepiwumifa.pdfIn PDF document text
    • http://djpress.pl/Image/files/38805420383.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc78f35f078---tobilaremas.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8e881e1c3fcb6464b8681adb04133e2f/5009717072.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/bizufajexodefajeg.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/b67d718560c4a13ab55e6be80bf2967d/96572001518.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a924592722ceefd8762ad8eb84a2fcc3/xiwopelaniwinakafeza.pdfIn PDF document text
    • http://budka39.ru/files/limelakebofonexidaz.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b98da80b68---63902830599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=average+cost+to+get+a+private+pilot%27s+licensePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5547a26c---92759320178.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_off00012073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 10628 bytes
SHA-256: 6e1ca7a4b39f9d975c536f8f45678c922edb2c854c331c280df765cfb60d78f0
font_01_sfnt_off000138f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F4 17088 bytes
SHA-256: fc2f0d52456491207bbcb1f94a46560ac6085a11cb99faf01a8f322b0f95f6cf
font_02_sfnt_off00016586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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