Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba25599f3487fecd…

MALICIOUS

PDF

94.0 KB Created: 2021-07-13 22:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 73a9ac50f333e226a47802817f85c58c SHA-1: 476072e35dd318bde29e80f3e78fbb064180f18e SHA-256: ba25599f3487fecd75fd5c06b90467d63884bb3ff78e7fdabc05c57c6f3c0d76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised or suspicious websites, likely to distribute further malware or conduct phishing attacks. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081af1b049ec---mokelatej.pdf In PDF document text
    • http://schokoladenfontaene.de/idata/25524015295.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/11268121458.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2277cde6594606c0e2e023106bb37061/66654069276.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074fb54390c8---voguxokalazutirexow.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/bb774583ece111d003e9d9754eb39cb0/vikoteguve.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/wezegekepafotina.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/pokeromijapufisasajamif.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/jupewadigo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/s0ji6um7864vj5pjb3hou15tmi/tizulebi.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/79ac0a4db0e75d996db57ccc47bd12e6/xalepemivaput.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/wujoruxinepopujimip.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/loxemivitoguvadotodujax.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/vnv7ieanq26m05ctg1su7m3639/vewobolekiviwada.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/48981226691.pdfIn PDF document text
    • http://grupophi.es/uploads/files/88078716840.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/bokozuzedobamusewibit.pdfIn PDF document text
    • https://tigaintan.com/contents//files/57637629761.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b434a0bbadb91468ef9780be6fd1eee8/21474793738.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/84451688192.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/9d1d9f848acbd3fc1aabf5380d346403/xadunedid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=specific+heat+capacity+of+water+and+icePDF 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_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 10776 bytes
SHA-256: 3c0f540760bd645da9b2c683b01b45180798121c4b1827db4b2fb27f73fb17e9
font_01_sfnt_off00011ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED5 19964 bytes
SHA-256: 5cf86a0bbcca14b9aa9b8c9aa993c0ad642991e85f34de7b7cb69ef4aa72c132
font_02_sfnt_off000152a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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