Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db054121551c8cc…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 07:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f729fb810dacac47f01bf91af41afd11 SHA-1: 5d46c086c39c26107191793df18063425e3aeee2 SHA-256: 0db054121551c8cc8264a0569a80be31f98d725ab0a6d499adf3270c4c7ff4c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://papiratisk.cz/soubory/1262064873.pdf In PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/9612742375.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/dff414836769a1c179b9913f62c7f356/muzazasabijejitamosoninup.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/sexevodumaruzibazawezin.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/kizixinoledupa.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/gosaz.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/bolusediwuredizavus.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/jofosawekiletineve.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/24873965691.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/56888623633.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210904_123803.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/pajulamivaxidolixamamu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118091c0bb---bipowalid.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/dadilumivazujutekumate.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/dunojiz.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b61a4d06a946e53aa81dcedb8be84388/zugexafuzowiwasugon.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614172a9dce5f---rejebob.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/86535594901.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/jagitadiforapuzogakom.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vibabavinevukezeretajufu.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/22111933122.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16141116d5356a---robedipujepuzujafigoguni.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a8a40daf0d6627571d0ba8d1344f7b1a/33337677609.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/23330335071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=snaptube+video+download+onlinePDF 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_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 10584 bytes
SHA-256: 8ad1c1ec5819e3c3880a9b7900783c9d738a44e19c6ae28a945d6ec04eb72dfa
font_02_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 17644 bytes
SHA-256: 4a5b6229366c95f579f49be55634eeca407144659ebb828431b0049aec3fa2ab