Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2a44eed731bd49…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 05:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: afc1e1a2924de004aac29c877563866a SHA-1: 737db847962ac9ed40e88e6e649d2120066d2def SHA-256: 6f2a44eed731bd49fc70ecc3e822bd69c7ea5c82cb1091f9a71bf27506d8cb0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as indicated by ML classification and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. The presence of 'utm_term' parameters suggests a phishing or tracking intent, aiming to lure users into clicking malicious links. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=discharge+summary+sample+pdf PDF link annotation
    • http://gzmingjun.com/uploadfile/files/20210816_212231.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160745fbe36f2e---wusezejoxenetisu.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/tidarumasogiridixopem.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/foxoruworasafawenupobe.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608194cab064e---20082252308.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/65083197369.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/042030233246.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1610dfa00b0768---dafagezabepevisel.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/o1lhuq2f8it98962dhs7aqtoh6/52342826213.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/dotosuritufi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7g2e84g54iasu73o5n8b9vlk40/rokawivoleke.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160804e4b1ef46---77877984022.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/nofalumovodibodovaz.pdfIn PDF document text
    • http://remobudostol.pl/pliki/59138604835.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/83641011689.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094922a7814e---74945398262.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/85739889255.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/kutuwafusadideme.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5gqrgmtpocgcg2rugh5m3as2g0/88241432757.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f89589b733a---36685069081.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd75d406dbd---zozoje.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/85971212256.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_off0000e6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 10960 bytes
SHA-256: d0a5a6d1147a775242c522863d531867ca0ab7b4cc05ffd29819454a4ce463e1
font_02_sfnt_off00011850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 17972 bytes
SHA-256: 731d14daacbd49ddd53a129b201508d508161021692639550f91edc90dc60bc0

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