Malicious PDF — malware analysis report

Static analysis result for SHA-256 026119f46751db78…

MALICIOUS

PDF

76.5 KB Created: 2021-09-10 02:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0cf4ba7f3319dac118832fbe09129147 SHA-1: ec9bb5c4fb8acbd8fd27a206f0e9d13bf71ec909 SHA-256: 026119f46751db781302e97dda1a592c8ba49552b0f9ce6d36160a745422f5bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of 'utm_term=o365+mail+login' in one URL suggests a potential credential harvesting lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=o365+mail+login PDF link annotation
    • http://bijverhoeven.nl/uploads/files/97439632933.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/62301880509.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/datuvodewa.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630846743.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/36020679907.pdfIn PDF document text
    • http://khocabien.com/uploads/files/53380686442.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/tozixogosunakot.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/fegixebimowuda.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/rawuvamewemosobav.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/48186038227.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613956edd33f3---92172807289.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/20816176793.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/59473438345.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/8841677452.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/wabetife.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/79915622448.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/fiziguweragizu.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/bowafekejenejevovemuzu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3ac84746f---78773417820.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161340834e0908---78629973789.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/3696290949.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/81479782668.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/lajumibut.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_off0000c86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 10452 bytes
SHA-256: 43702afdf5d7ac653e7613ce8b59b54a419e6df724e0d4536be0fdb2ba868330
font_01_sfnt_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 17116 bytes
SHA-256: 1ee64cb495807a2fb10b1fdd5df011adae8d48fe8b598135aeb9ec579e27c592
font_02_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1