Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70dd2a370f4db9b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 11:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9cdbbe4172a65a0b12dcde73b587498e SHA-1: e90a51e2bac54d2b702b7410111f39d5fb4f2d32 SHA-256: a70dd2a370f4db9b129d0bc72820e45f8341c0970eb5d432980aa945f608ac8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://fulzugaskozpont.hu/files/51543659322.pdf In PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce569805d69---87413934696.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/rbg7nucine695ds8g1ds6c5q54/xivodasipisawovik.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/52942047045.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/b65nd1v5f9rkv2eo7iongh1ts6/45661516724.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/4v0f8gj8a42be8iuejmupueee3/50272076553.pdfIn PDF document text
    • http://tchid.net/userfiles/file/44640910625.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/dizirifegevisureke.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/utudapada.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/limuzo.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/tiwugapomobagekudutana.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/9370889592.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/nitanogudi.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/34709726049.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/c7c50f4d61cf0c70ca72ea0c5cb93ec5/pavifuvene.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b05ae1fb0---64769272879.pdfIn PDF document text
    • http://salwex.hu/file/15786444601.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d3996ca8effd02d65b3a6b7bc814a4f0/39416398031.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/bidimiga.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/vasuva.pdfIn PDF document text
    • http://biosite.ru/images/news/file/65474163701.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/junatadopezo.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/066c59074da3adfe3dd0d462c77705db/59316095451.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e67fcf3aa1---bewukumisada.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/50003214768.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8uu3hgia726ghrqsse1rshqsl/pelataxutotip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mitosis+vs+meiosis+worksheet+biologyPDF 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_off0000c04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 18972 bytes
SHA-256: 6c7a24c4d645dcced60cbd77cb6a6ce7c7d164deb064967fda768bde8eef781b
font_02_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 10780 bytes
SHA-256: 0fff9d0b6ace4c6223e2076d4a16bce58ad9d0f5d9e9f2275c82d1cfc5612133