Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88f504d9cb443f4…

MALICIOUS

PDF

86.0 KB Created: 2021-08-21 16:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e2a8dbb99655b2ab3acd2fe7e3c37f6a SHA-1: 17a1cb463b21ff675fb7a3c71c3df44a408ce303 SHA-256: f88f504d9cb443f45f9f38e0fc79649223f30f84322911134b0a17ccd40666e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external URLs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user interactions, common in phishing or scam campaigns. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=papa%27s+scooperia+hd+free+download+for+android PDF link annotation
    • http://ecogestval.com/userfiles/file/redetijuzajas.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/20201077251.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/97824964976.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/81931375713.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074533982936---39100606500.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/musewotewinanasas.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/21245909860.pdfIn PDF document text
    • http://kmsenior.org/file/files/kojixume.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/16590771076.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/pitixuvegeluwobuzelovuvu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a1c16478b---mugikaseke.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160947c01ebc81---kimuputisesadud.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/s9bu9dmukeinlq2agjgo9q7ecj/bibikaze.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/30241447832.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/32b5589781ab3c514b5f699b5f987206/wukexogaxalarirejoriku.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/84995659553.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160932ba7414d6---vonabesovanu.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/63382030031.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b967a99932---98760525294.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/67069511202.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/jiwusogawenizexig.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/42099071979.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b4bc7a034ad4d37553bef9ac55fcec65/jujokenevozitevuguno.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802281e13a9---jakirusasijonavurefenewi.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_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 17892 bytes
SHA-256: 8ad1f2eb6dc4c6c9ac380d177a51fa22d02327318369471f7ea8107bd9d41d6f
font_02_sfnt_off000130c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C2 10740 bytes
SHA-256: e48a930d819e357787af998c28187fc7836d8e11db8666de48a595e36b9ceaf7