Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b560a41d1b86731…

MALICIOUS

PDF

88.5 KB Created: 2021-07-09 06:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e734c1fc44a23adca1b48e1519f3bb1f SHA-1: 6c87de1f64e6a1b21af19b2c24b560a4e8092037 SHA-256: 5b560a41d1b867312b29a66aff99c29f3b0a8914ea397bad49a5fc94289cff3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/3168627555.pdf In PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7a07e68c929081bd9de0cd5fc6de7f98/xemotejidedeliw.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c680a8098b8aae776c7cc1d65b3c6bd2/jokesotapififatoxexotu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7727d9e06---lewarilaka.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/5dcb8b779cee3e78d26d0419fb31653e/70709137690.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/omfec518kag0hbcqjdqo8gbnd6/75614328949.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/wupulobubuzi.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/35487040520.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/20b6c6456249f8cf5fa7279876fb0eaa/2374559936.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/erk0kbftsu403o2dmj239fssit/davekosewuxiv.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/35677579107.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847813c6ea4---65701163546.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c978be0ba0---70780946798.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/topokazeli.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ospvg90a2o8nb4r09ccjaf15t1/zafirorinavotebesow.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/wutap.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bfcf4f290---xuvulowabifezebewiwimuna.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725f6390eee---63371268295.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/19621079526.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e9ad6f5b7---zaguja.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/77548712293.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/gudulaxiwijijigusalolopo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/26fadd2a1c5b89e3b35a2ddb90107514/vajil.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf20356d995---50340877183.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ebf7a9faaa7d7d14d0dfada3fec39374/godogibojibogifom.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9b1e8c64---50341574553.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/tighvc8k2o41p3pp3k1nefhjts/nomefegatudava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=articles+on+online+shopping+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_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 17272 bytes
SHA-256: da9265ec398096c77b9cc8cbb16fae1a209905caa260f67a56dee26c43393fee
font_01_sfnt_off00012254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12254 10716 bytes
SHA-256: 749d15177bf864b8b22b01b8e7099c56bca7c2183acfce0dffd96b8ebb5e0b15
font_02_sfnt_off00013aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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