Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb557dc28e58c23…

MALICIOUS

PDF

82.5 KB Created: 2021-07-31 18:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 01db3613420c35fecdf70d429dec89af SHA-1: 58e930859a9555cf52281af30f9fccbbe870449b SHA-256: 0fb557dc28e58c239fb998e77235101d66f1bd8021f4d91954f0422eb58cd52a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=pathophysiology+of+heart+disease+lilly+6th+edition+pdf PDF link annotation
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c80147cd89febfc041d8ec691cff3411/wipenumeposaze.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/16695126279.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/majijuki.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021061410582020.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/72148215720.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/60351385667.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/3912908519.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de395e95b2---3757508146.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/48179039203.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a929d6f978---mizewavuveweberuma.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/5b8ba18619296fc7881bc49101d02e06/tedowedomulexodelo.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe1a8d47ca---xulerudonepisef.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/7daoeuvbmc5qg84v9k8vskubpg/14969509505.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ea1b5abe1---lekuwo.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/693a79884f24b7f6190bbb5f8a51ae05/14335586887.pdfIn PDF document text
    • https://777mto.com/contents//files/tesofimededebinopigabipij.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb880cb89---leduzovixujiw.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/892fd942efbef2dd6e712815ae830570/bemanozusupodom.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/863b2d23a797882010870dba725ab15b/49918546452.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/89807723218.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68bab6bac---12572830956.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609faa82193d6---36397648371.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/537450f5f54f0c06bd178fc0995651c3/nupezelalaxud.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_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 11060 bytes
SHA-256: 88d41add9ec19e6e2e9ecf4fda3872a71f2d970b000823bd0e02a430fbffbfee
font_01_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 17416 bytes
SHA-256: b2934e60e4e689bbcd80ae0e9d0ca766072aa59f96f3ed14de8965e92fdf829f

Open this report in the interactive analyzer, or submit your own file for analysis.