Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4513ccabba9cbaa…

MALICIOUS

PDF

91.4 KB Created: 2021-07-28 04:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d2894db1821ec14535f0db1ccb86f7e4 SHA-1: 3e1ee83f3542974e1031651a0c525feef51cb745 SHA-256: a4513ccabba9cbaa97f6328a7e0afe047b885b02baa90d3966f6e2c788dbde55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cc053c88d97c3a0ef51b58f673f7775/95744914022.pdf In PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0brdcm929uqcvedu6quekh6ml7/terab.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/17046071202.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/0cfe8e95c21dab9e6c55c30e96b3bde3/sanalafagasija.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b1b4dc8a---56301060372.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b1789fae---32953442735.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/puguzelededogujedap.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b1190576048bb9536de1aa67ed53de59/mopul.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7b42d1782---99874862233.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/pugibavav.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/6196545620.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fb66cd823---nulopebefominaxupe.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a06de30ce5---5491012291.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608250bb4fc9c---44075154212.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/mopulotetite.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160705a9c0095f---79804872074.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/61592133552.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/26570564209.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/pakarupimezuz.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/ad9d5526079aa32556dbbe4171be09cb/poxibemotabunoteboxone.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/40578376255.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a0abba2ef26---tipepazoxagegotikaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=libro+de+matematicas+de+3+grado+de+secundaria+contestado+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_01_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 17108 bytes
SHA-256: 5af5f38e4a47c5a1939610b32c8412b025c32cea859392a9b5ce91aec0e2b164
font_02_sfnt_off00012cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 11280 bytes
SHA-256: 5f963a4885b8446b39b1c429d8cb22f6b6aceb30dce4fdb97c445c6ddf0a0166
font_03_sfnt_off00014713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.