Malicious PDF — malware analysis report

Static analysis result for SHA-256 0183d4a0baa85d29…

MALICIOUS

PDF

91.2 KB Created: 2021-08-10 07:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f111872c223ea2bbc66d5e97a4c99bfa SHA-1: 4dde11b4a78dfa83969cc9f451fe99da09e92382 SHA-256: 0183d4a0baa85d29c7a642df3fa9b6e46dd8867bb64c8d1beaeb374de484b8ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://beautyyaurient.com/editor_upload/file/37145759341.pdf In PDF document text
    • http://lt101shop.com/userfiles/files/31373937190.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e062fc6080---fupebotu.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/wumumuresilajofokowali.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/70927dd3b085749a9f937bee0c8c9af4/66202825526.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/xupejalawopekibomixuwiw.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/wifisijibatuvedugusamawim.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06d5168501---39996594462.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c428352bd13---29264955716.pdfIn PDF document text
    • https://aokman-drive.com/d/files/botofoloxejo.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/4t8r4o3o4ogr245rp8669cq582/vazag.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/xubama.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/kobozesajabodaxexazuzode.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/luosof1e1ggepua998di5f48bc/92563413086.pdfIn PDF document text
    • http://beiks.info/public/file/kasim.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/2326097061.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ud5vmcc7lvd4j39qtn89clvmum/kepazugonekawaxomi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/075527765035f7d8bc915d8f5cad4db2/26776160708.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/90607865984.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/xokodu.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/4263273587.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ncsug8ddpbe2oeu1tf8fbd3jg1/falumemesexibagidujapos.pdfIn PDF document text
    • http://hotstamping.pl/files/file/83358186907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=essays+and+aphorisms+arthur+schopenhauer+pdfPDF 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_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 18212 bytes
SHA-256: 1b39d8622183c8822d47aeadd2a440ad9dd3ddfbdad8f02b3b3873be321f65c6
font_01_sfnt_off00012cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CC 11036 bytes
SHA-256: 1fc0b35f882bb7284b51b9e63fefd217a5e1e43bebff304280d98a6973529510

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