Malicious PDF — malware analysis report

Static analysis result for SHA-256 04324b19126c7d91…

MALICIOUS

PDF

80.7 KB Created: 2021-08-24 14:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6ba7c4fbce74f88ab12e654e765cedab SHA-1: 57d202ffac8a6704ddf75aec6567a3c9e2aecab2 SHA-256: 04324b19126c7d91c2d26a31ebbe8c1959192d7941b62cacd4c093e31fc1ea04
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3100f6df90---nolefutugekenuxer.pdf In PDF document text
    • http://suamanhinhlcd.net/userfiles/file/64406348240.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/20153052316.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe8d422b57---80447874197.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/50293258469.pdfIn PDF document text
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/tenasobapizodegoxilutu.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/75459325284.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/bbcb17a7b5cb9562cfe6ad7ec7920164/kigenotapewigabadetu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4c18323a---medikiwomasulesakuwi.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611fe78038ec2---88326643527.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/fosigibaran.pdfIn PDF document text
    • http://mesterek.net/tmp/soligu.pdfIn PDF document text
    • http://taociren.com/upload/file/210818220750234377z5w9n0kuyu0w.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/46282384044.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/d0l8lh4nag3jkjqetao5os36ti/84456274085.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/41273076480.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/25970744629.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/zomifigakexawipa.pdfIn PDF document text
    • http://come2menorca.com/images/file/ravakebujepafo.pdfIn PDF document text
    • http://kleiberit.ru/files/file/53342059353.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/67481907513.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/jigewadodumozubuw.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d477939bb8---dapubu.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/finmg5a1arpr3pfon1titqprt1/wexebupaxazoludaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+eat+ice+applePDF 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_off0000da9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 17036 bytes
SHA-256: b73b1e5a28bebeb31424d1b04a198e744d397efce5419ba9c213987bcd34b909
font_02_sfnt_off00011f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F32 10072 bytes
SHA-256: 42febd3b6df82cfbd0a322a6a876594dfdf260becbc42b3ca8ba901714805e35

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