Malicious PDF — malware analysis report

Static analysis result for SHA-256 02959b4ddd387044…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 00:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 765df18312265eb1023fa189dee133ee SHA-1: b683da8ab21982a089a4bbc39185f01af8316605 SHA-256: 02959b4ddd387044c76d6fa7c0ee17081ee92cbfe504fcfbd295d545b6489a5b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm, likely for phishing or to distribute further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://tuvanluatdanang.com/upload/ck/files/46923587754.pdf In PDF document text
    • http://mfahk.com/upload/files/kivesifij.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912a790212f---94866898841.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/86651413846.pdfIn PDF document text
    • https://biocoils.com/img/file/makibu.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/bq5tkh4bm221ujda70f0mbj0pu/kezivinemebupufaguge.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/76417520250.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/lagegumek.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/towar.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/54f2ec5618362d40a64fe413604a05ee/47008285398.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/dizotezudezojadud.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/19487247195.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/suhqh9e2vg8a4vll72e7m0aci6/divudasoxupogozexefobanu.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc50880a539---fekananokonawototokegowi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc3c5ae367---xedujodotijutarimaf.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/72026256340.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/lilosovifetepegase.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/dipamiberopiwifumuwemifud.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/hpfa1ek2qhpfh3dbqa3c3sg9f4/xokofobagobagozog.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/tiwutezalatagisalanipaza.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f0849859---rixomapejonawejelajuxila.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/2456bd8eb46c9b3560e1aaf4e2435550/34121457838.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/59248827361.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/23137387782.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acac1b79976---pagopibava.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/sibavufe.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/gariwobagatodux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hochiki+latitude+manualPDF 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_off0000d576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 16804 bytes
SHA-256: f635a242ecc242cda188a671acfba274091dabb4b90f73f831e3ce63f98cd429
font_01_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 10552 bytes
SHA-256: 4a6ce458564e5a620339cc4efc056561644ff7bc1b211272986e051c6ef220ad
font_02_sfnt_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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