Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f4b98f3e26f166…

MALICIOUS

PDF

87.4 KB Created: 2021-08-03 05:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 57e2e7ff8331863741f9389eb588be66 SHA-1: 8d834ecff83a2df02a0f8aaa9ff94a29c5d91a77 SHA-256: f9f4b98f3e26f1664c9878288f6bb0b8519c34ae38e70d88e096acf7f035fb36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5c08246f7f791a8156dc1e1ca1582ed0/21858500231.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/707fpic89hkjau1kmuu2ogvf1l/33804776277.pdfIn PDF document text
    • http://lg-palette.com/upload/files/ramejebok.pdfIn PDF document text
    • https://wineart.online/userfiles/file/rijojefusireponuwirip.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/lofogeluxixawibumex.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/10934531989.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/dakepafavirelex.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b612b2e59a6---25024254575.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/74n07nmoi3hku51elddihcfik8/69711196969.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607736142c309---pejawafo.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2e113cbcffb9ddf590050e198e56675f/43112626036.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b520f2ce8---putabetaselis.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/gazumajexedifero.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a631bcb1e60---49484587913.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/21242832987.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/i25h39u9lfc5m885ldhdhp2bbm/4317836479.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/52905836934.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/84372605850.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/31942150099.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/e594a3f3126f80bd32359d5fff5e2b2c/kirewenigalobedamuwepo.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/97125474404.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/96995152299.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/pogokimejudisuruxexa.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/man4htprl6lt50bq9bajel5079/67553486819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=building+muscle+after+40+male+programPDF 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_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 16416 bytes
SHA-256: 494207b8e6e097c3b9beb18e6c652048c3596e95372b0f7c8eb26a0de0ac39d5
font_02_sfnt_off0001352e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352E 11316 bytes
SHA-256: 50f29f693a4e6348240dae29c1db5b20ca8d5b51f98dce58864792a86b75c09a

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