Malicious PDF — malware analysis report

Static analysis result for SHA-256 5780de979cdf8bbb…

MALICIOUS

PDF

84.6 KB Created: 2021-09-12 20:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b21e8c588de76081923880ccf6babd22 SHA-1: 791d51f3c541ce27d31a0bb6d329114e9767160c SHA-256: 5780de979cdf8bbb0ff96722251f9c20d6aa63b0a5d865fc965ae3683a74985e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=live+tv+streaming+free+on+firestick PDF link annotation
    • http://rowerowaszkola.pl/imgturysta/files/93459493102.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fb4e5287f2c04df509e1720b2fbb4eb0/65816648259.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/jipijozasodev.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e03b3b9ff---96377051769.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/tezoxiparumax.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/46263333489.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/29770668471.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/8650046888.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/wobasidepedepaxebup.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/14336948070.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/47719093467.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161316c4591ef3---karoxopuxutoxagakoneruji.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/20132354133.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132350b797bb---kemalelunuxifaluvuje.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd05573793---11831120950.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/54580439068.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161303b9868bc2---6785882564.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/bezuku.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/69825107016.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/zokizasolugifividerizene.pdfIn PDF document text
    • http://blccy.com/userfiles/files/xafakijojapak.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/3898146817.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161302e4c19d15---86593412230.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_off0000e69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 10748 bytes
SHA-256: 976af2a265947c58a2a22b86c3d476db88c9bdc126e26b9912d3828475856ac9
font_01_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001177b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 17400 bytes
SHA-256: 585631b6a5d7377bc8860cad3f6d4cef2f8532c8e2f8701133c8eca895b527a8

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