Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a21fde1abbc99ad…

MALICIOUS

PDF

84.7 KB Created: 2021-07-13 10:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4da8a38c6b33c0cca5a0c7f28a2f2798 SHA-1: 569efca61cf5dcd88417ef06b2ea4964a605ebd5 SHA-256: 4a21fde1abbc99ad4eab8b1174d72165ede704f1d62db3894b9f09213ea33ace
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The structure suggests a link farm designed to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d92b0be3e---dezigekuxakupabaxezasog.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56b7260ba---dofarimow.pdf
    • http://singer-island-condos.com/userfiles/files/fimasemono.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a401a4bb7aa---57277716923.pdf
    • http://watsonwilliamsreunion.com/clients/82103/File/lilolokimuji.pdf
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/wofefopivewo.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/78e65ea447e6ad9a81345ae0a24b3d6e/11908219504.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfbfec2b39---bomolitigonu.pdf
    • https://hosvagyok.hu/userfiles/file/26223542999.pdf
    • https://wsbtitan.com/images/file/71192733336.pdf
    • https://n-v-v.dk/userfiles/file/laboxaralatupududopi.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/abe5243bbd18ac3f01df923de3ad5191/vesapomosakiwenugafuwe.pdf
    • http://sarljarry.fr/userfiles/file/nujevejitapivew.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3b54a02a9---21732339813.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e973ae9ef06a9cd31ece4d14e9557597/78025226193.pdf
    • https://seikai.jp/free_images/files/ramijetemume.pdf
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/tazisatemituvemaj.pdf
    • http://bayanairag.com/uploads/userfiles/files/gokebemazitigejisasago.pdf
    • http://yuha.be/_files/file/89760891966.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c4a3e01f1---wewixobe.pdf
    • http://alarcon-v.com/editor_upload_image/file/93948967164.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/81ee4f37754e78688f62f06c636103e9/garedaju.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089798a25e1d---latunabunelibi.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f65ecdb93e---segufubaviroxiwagi.pdf
    • https://adamant54.ru/userfiles/files/duwefumegamo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+check+who+unsent+a+message+on+instagram
    • 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_off0000e7b1.bin
f30db058cb49310fd77df3d16753157deadb13fef04e2cfb177e45830596ef0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 16940 bytes
font_01_sfnt_off000113d8.bin
6be13d2fde2f997ba4527a59e636bfa5d780f010bd1226ba527c07713f7a7bc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 10900 bytes
font_02_sfnt_off00012ced.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CED 16792 bytes