Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4220028be6a81bc…

MALICIOUS

PDF

94.2 KB Created: 2021-08-28 14:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4cc6d83330d8f9b5824fc2c1360c9f6 SHA-1: adc919544f2e2ae1ff7ea8cc6aa1ad4e09154f50 SHA-256: f4220028be6a81bce5d59779f98ab83d14d17924f74ff0e1428ad16846106e59
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 large number of links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nanosoft.mn/images/content/File/12020454387.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f1ed26591---dodasuxaroj.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6193585310---88159127003.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161251eb969541---53348739913.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5d5bf6d272f9dc7d5f0530112c1ddd73/gerobedixiperujida.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/23733045827.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/dekulalidujat.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/ragagojodate.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/59708120992.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/dibumuvekubox.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/rowirakavura.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/184ebf38cd3d1a390e51f3e115009901/66435432621.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/bafeluwikovogeso.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/49646386824.pdfIn PDF document text
    • http://mutitar.com/user_img/files/nitozib.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/kmjrmvephc1i6nj5v09921laj2/gevomixotewenezegakefimo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe203bb47b---33634481177.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/339936d53962fe8633f595feea48dd7b/zowemomofitu.pdfIn PDF document text
    • http://kelvista.lt/images/files/60790459750.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c020f1cab4f---tonupinapuju.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/digokeximu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=quotes+about+sky+and+treesPDF 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_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 10608 bytes
SHA-256: 34844420a788ec10444b47f351aaa56d77d1d55ef6ca48164d82435309182954
font_01_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 18876 bytes
SHA-256: 4d8751801ef5bc3e2f82265e51fde120adac8c96c0791355189bf3ef8781150f
font_02_sfnt_off000151f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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