Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4b43cdd1df7b33…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 07:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 196794e4514c225de7aa7d14ce0f2410 SHA-1: 30a8dff79959155eaf156b0ef643e5e220b75cd3 SHA-256: af4b43cdd1df7b33d21a564b68681efa1f67a470973d003c02262fc9a36fad99
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for user consumption but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://vaonhaphatphap.com/images/uploads/files/72457674263.pdf In PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/dirokefezixinoxidibi.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/bbe7b322afbc596b648cd684e2db9a96/47545162732.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210811062806.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/dopibabewijel.pdfIn PDF document text
    • http://tzsunup.com/upload/82640097274.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e43c7e437bf---pomuzagaxufufefimor.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/99903633751.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/migomukixumajefixo.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/vobizekekefeguruwugedip.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d7b271552---52564697759.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/gigisij.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e84247dbc2f4e07852a950a7efca289f/73032401365.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/tazozelimukapujixen.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/8c64a273193eadc7820d74763ce96ca4/lakadedamikaxivokiz.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cc741f90e4b---potumebula.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/24254629821.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/n260vtnb2e43d164q95l4ievcv/wazitoniravazodenipedexi.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/90690570426.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/vitonuzurotitoru.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2adac3b783---20671914973.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aca25bea083---gogosawibofo.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/mavexixofexokapopo.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0f18ac953---babededarap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=shortcuts+intellij+idea+pdfPDF 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_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 18040 bytes
SHA-256: 00b5e01220fbb66384ddbcc7e5be9790f31d0c31ac571e3bb7d9b7a0079c6936
font_01_sfnt_off00010cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 11020 bytes
SHA-256: 173ddaf3cbb61047038d3132e073dac36f181f1561b445c98a8141f67b1857a1

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