Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19382a243e722ba…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 12:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f32717cc5f128bb585a14ad4ea8f642 SHA-1: cccc9795c8eaf9838c17868f63dccb4706d81f57 SHA-256: f19382a243e722ba3d81bacbdedf890cb9133877667464e7b4aa25d3347598b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=hitchhiker%27s+guide+to+the+galaxy+audiobook+free+download PDF link annotation
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/wosorifabadojugapubo.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081273359bff---17518145777.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc0e95ecc---najivenawuvuxularolita.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/96431919901.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/5247033114.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0888add18---fejilanuwurosamam.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/92cdaa0d36bfca7d6e21ba75210a2090/jujisotaliredanarunumum.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/reduxukexaxuromexon.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9bd2baa59---40938818767.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c47a4546---furuvum.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/07bd0d55c80acf035ef99646c1631d08/46240312293.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/volixikasibaluwotegu.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/35797803978.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/i52lsuau1c6o3d4s8ecffitbgg/49162405100.pdfIn PDF document text
    • https://agermag.ro/mm/file/85550561427.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ed2f0ce39003e50f47b5808fbb76ccf3/33109071222.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/diwediwurev.pdfIn PDF document text
    • http://amdind.com/userfiles/file/bumuki.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd505359dac---54318885462.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/sogujunasetepowewot.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/99c4292eb1519daaf82a793e919602dd/75134032629.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/68505304615.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/44783821195.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/dunubisidi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/n1o8blg700fqj3ooo6mmscpflg/fodes.pdfIn PDF document text
    • 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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 18136 bytes
SHA-256: 0cda7827fd3c6058c18f00882370717e33d33b0ba3e0634e567904c1fc6fe02e
font_01_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 11416 bytes
SHA-256: 37e8dfa8871d4b0ad2a3da7f5aba60fec0f3dc1aed4e0da3f4d78f5313c6f44e

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