Malicious PDF — malware analysis report

Static analysis result for SHA-256 53780fd768ec02c7…

MALICIOUS

PDF

132.2 KB Created: 2021-06-28 02:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ddd9529c6964f4307d66283a3a5e4de SHA-1: a63b18c2751f6a5ec87c9672fc7f0b38b3d0e048 SHA-256: 53780fd768ec02c76322afbe5809539a27cf1367cc3653ea197fece378462bf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary purpose appears to be directing users to potentially malicious sites through a link farm, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cfd888e8a---64136997585.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dbe7f4103---81831507756.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1d4dabf83---78335201530.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/62454571200.pdf
    • http://bortran.com/upload/image/file/20210531030012.pdf
    • https://yukkumpulgroup1.com/contents//files/kajired.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/43g96igd4pn9c5efcreo7rbrc0/texidefa.pdf
    • http://bkht.vn/userfiles/file/78968899406.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7fe6cf046---36213876980.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096bf907359d---wuvuvovimabexofixejemeni.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63d6c0b2ea73e8401ce2bc2e575324a9/63247271309.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d6cfbd9c9---36162315429.pdf
    • https://virtualpulse.eu/UserFiles/file/21587484473.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160addd21df46d---rexukutowizofijud.pdf
    • https://vibangthuaphatlai.net/uploads/files/97130100588.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/1420ce1b369c8ca63ff45cb22f2e8d55/66450749108.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83ff45f3a---lemamidosukeparuveduvimo.pdf
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/wemuveporo.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3153f04f02bb821ce1776116cdef9817/wepuxaduresizinukunu.pdf
    • https://liderpin.com/calisma2/files/uploads/73111533679.pdf
    • http://gilendor.cz/userfiles/file/xapis.pdf
    • http://www.cddfct.com/up_files/file/gokufusudusikazapirag.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf91e73eb---29144429544.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4a257b321---55637716180.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=charge+of+the+light+brigade+themes
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4f6bb9ebde0518d582247590fd8e337f/lavivagesunixivenu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a16e.bin
9a09eaeb016e23973e8fc1cfbc9bacbff66449bf45efa5328dc192c6ccba5c41
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A16E 10868 bytes
font_01_sfnt_off0001ba55.bin
bb20fea5572ddc2c8d4c8eee7748ff343d97ed757716563de7c212872b206b22
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA55 17988 bytes
font_02_sfnt_off0001e92f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E92F 16792 bytes