Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52d51805b9e31db…

MALICIOUS

PDF

87.7 KB Created: 2021-09-04 10:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7696de758ab98d9e1fd1ca0ae7b7e3d9 SHA-1: 1d3ce5e94bc127b2cd543e28691d453149376ff8 SHA-256: f52d51805b9e31db7b472c738fd4732d74050cb152736bb367be7a7faec59592
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into phishing scams or download further malware. The presence of external URIs and link farm heuristics strongly suggests this is a phishing or redirection document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9686

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://crysiq.ru/uplcv?utm_term=msds+nacl+pdf PDF link annotation
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e6aa9827706---51970923546.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083f7c590377---desesi.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16086f7b344bd8---55871218583.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/062f72bc37477c17ce21b21ae0205b88/71974953701.pdfIn PDF document text
    • https://technoray-medical.com/userfiles/file/49370498452.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/2tv28emuf9qreib3dv7vpv2471/turuteluwuril.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/39014181010.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/laravapizulen.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/19316997740.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adce546e28d---43687819020.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/welomofotuxilapitarutoluz.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0fa8e4670---31875493693.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/rewifixafilupelejuxemo.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/94997928321.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/15673768862.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/jekis.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/lobinoxofiwiremujizarikit.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd9398be6---nuradapeposadip.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/6c0dftcp58f6iq5lpkd2lb6lt8/78073219197.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210513060825.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/pabezuzerixavelidanami.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf0db8630---melebixolabejafubu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160739a547a36a---76275039418.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/46679689744.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/1cc156dd23b57c423a9eb178e9e7da12/zaguzilo.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/waxenuxulopomobusit.pdfIn PDF document text
    • http://cityfate.com/files/files/nudomadexofibubizawuxov.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79A 16520 bytes
SHA-256: 11de3737bd9d552fda6eae5632869f510d7d4cf12fa1c05daa1ebe15d02cf392
font_01_sfnt_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 10064 bytes
SHA-256: 4b3e3a22b5347e22dcd589c8f12d54aca3721d7af9a5f0864f13ff51cd9d2ea7
font_02_sfnt_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 22872 bytes
SHA-256: beb2ea73fad0767bdfb1b632c1349c0322482a400ad662e494f425de98f165e0
font_04_sfnt_off00014655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14655 2160 bytes
SHA-256: 76dbda15e0b7c0364c7b5941651d255600af387744c3cfa7d276f6de4c2be5dd

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