Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa10da20cf26e900…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 18:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a444ec2d53a73e989325d7bdc998645 SHA-1: 9b56c0716571e3a8f28ddad5c7b2d69280368788 SHA-256: aa10da20cf26e9003e3258416e8f0aadce10d67c42f261c36f15fcde82919a10
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms strongly indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pistant.ru/uplcv?utm_term=exercicios+islamismo+pdf PDF link annotation
    • http://tjjjsh.com/uploads/files/14799917076.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e4905b3d12d---najudupanurebipanavig.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f00d64992c8e1b5e08574bcd8d05d80/xopipusumetizakomosugun.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/gikes.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/750281517.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/42410060480.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/83128297208.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/putiwafulejazakine.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/42956287138.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/musubixigumojeraxefugu.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/robekonigesogeje.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/dubutuxosuvoziwubege.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/golidarakotibulogaxur.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/nadufeladafagenizuwal.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83b1c0b6b---dufojewe.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd43ceacab1---sozevebupawejanavawojopis.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff1d3e7ed34528f262a0f98f06cab9c8/51512167528.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2ear751ubjepop8r8id467tngu/17119130983.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/padovokisilukivan.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_off0000d1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E8 10664 bytes
SHA-256: f34f525c09bff04ac4085bda90acb548448ce18f6d350971bc1a5fa4e79c9575
font_01_sfnt_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 18840 bytes
SHA-256: 867740ec8ec7b871a00f1b095dd229b9b1391a61a2269056792c597b29269df6