Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0489fdc541a0a5…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 06:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6c2a1cfa8fe9705b0b65ba43f41b575 SHA-1: 0b2a17162b0946a1d8b52331632f89e816f09c53 SHA-256: ac0489fdc541a0a5fbf7cac4ad28dfd3b46542e7fc4dee87626ea227c9048cb7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093dab3c935d---xiromug.pdf In PDF document text
    • http://dioceseofniranam.org/userfiles/file/rupejitopovinoj.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/967bbe3d1d9decfd04bce69751b95ea1/mufurikasili.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/lemowowuzopafako.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608493618e400---pagenivovozafem.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/jutakoxamexowode.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/vrcasahn714oi1gu3hgm5rpo86/43972004723.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/9a1kflgas1iqdmp5bm7pqrmcnn/vukodub.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608862337c2fc---paraloxubemulozobirate.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/xepunetukawapefa.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/1857006807.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/50273235346.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfd1ff35b3---35573697701.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993ac837175---gijabajubumed.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/uv0trb4jcrds2co4lucklg2a6p/mafoxepuxarabaser.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/2648780383.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/79a1a0598750de4154d9ec8ec8636d0e/rabomibixed.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5vf5nnr7h1ohnbasbejj80aum0/55882311469.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609922d5934ef---23629748762.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/79754997306.pdfIn PDF document text
    • http://moretonassets.net/userfiles/90567555547.pdfIn PDF document text
    • http://hotstamping.pl/files/file/powunumawisopetikete.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/90426360679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=advanced+equity+derivatives+volatility+and+correlation+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB100 11020 bytes
SHA-256: 3b0b22663234485dd1f9152f95feb41a43e9297c02004b88e06a6e60cb3313ee
font_01_sfnt_off0000caa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 15924 bytes
SHA-256: 94d07cd66783d8e0ec252b7e4ba32b74e0ddff415eb3a8da1b556ec0c97f4559
font_03_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 16080 bytes
SHA-256: 6ec0a307146d9be2bdd9dd9a35227856c774c3cce985d3f038f6c9b4f02e256a

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