Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd40c0427c07c9a0…

MALICIOUS

PDF

74.8 KB Created: 2021-08-17 06:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: a02fb5587e7350468fe015b89901fe70 SHA-1: 45ec1b472394a65c09c5de71a1f6c1b8e9d926b4 SHA-256: bd40c0427c07c9a0d1f4218f062881b4e4db7c2854abc440dd8688abf84d4f1d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The embedded URLs are likely used to redirect users to malicious sites or download further malware, aligning with a spearphishing attachment tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://robinio.de/wp-content/plugins/super-forms/uploads/php/files/n609evl7u4gtnjlf7jgj2jkjfv/30630168168.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16078e872e3849---32726253710.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/mosurakoterukixew.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6ecd655024c413c8bc7418870e48a935/78305278331.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a37d0fafbda---famowebovelexo.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/21394565656.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/xakako.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/fidas.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/de7dae45da1926190dc7f36e17b492a9/51258301570.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/122771931.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce19a9f92d---14609954599.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a11bbe688ab---gotufiwuvosabud.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/tisijagosajeraxatilimire.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/tufububipe.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609279c5aa694---netinujetowuwat.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c9a3d070c6d912eaf196e20d947f13f9/40579205784.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/10862996079.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d95a8a54c---lonemujoda.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/7096854131.pdfIn PDF document text
    • http://santeh.md/img/files/bapoxaxuzedukewukemab.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/mupapekujiremef.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/rokawufizeposukim.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/serot.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/sevosevoged.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb85d7516e---20629676158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bloons+tower+defense+6+unblocked+hacked+weeblyPDF 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_off0000c2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B5 15624 bytes
SHA-256: 742986665ab4254895b3655e02058919432619a41184e9835901ab5c54404f1a
font_01_sfnt_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 11232 bytes
SHA-256: 074c5c1da388a83c22ccdbb5eeae35cba70256e60f84a0407bffa2234e99d118
font_02_sfnt_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1