Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7d8745dfa5d32b…

MALICIOUS

PDF

116.3 KB Created: 2021-07-01 20:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af119b4e0025ec902ede502f7f250374 SHA-1: ae1b14109c12d50524a8254a85dc66d24af5ece1 SHA-256: 9a7d8745dfa5d32b43eec4d9641d17e4fe56269718e0dbfdb6d0d36525f1e62d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack likely aimed at phishing or distributing additional malware. The presence of external URIs and compromised CMS upload links reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9688

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=meaning+of+shigella
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/lorajobaviran.pdf
    • http://aimecostruzioni.it/userfiles/files/66867046099.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/aauu0m8hnod3cu505m1o4mkd2k/44062745218.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59c5265f5f---79783022523.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/45072d32ba06f34462b8ceb61c808a78/27889515723.pdf
    • http://www.aqsclimited.com/EditorImages/file/terosokopaderilomuguzus.pdf
    • http://ilturismoinitalia.it/userfiles/files/73089411226.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/ledapavu.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f32221b2de988959f74cbf2db80a9cfc/laboxevifabose.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c6245aef5d7b396a766d01d32f0c3d4b/gulomuxupenasamo.pdf
    • http://murasakijr.com/uploads/files/wofin.pdf
    • https://aaaxxion.info/images/file/50510573609.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ddc405b4c32ffd128748605ad402a11/kewugudasivumogotazofugi.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c949388a553---lamotoz.pdf
    • https://bandai-k.com/userfiles/file/vovupoginokig.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089320ed737b---ximisezu.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a869e4b0758---pepeniwok.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/635c802ec450aa3a91ad2fac7d7c76c5/xonuwineli.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/00e1c6329964bb9a954516b5fe528a9d/61385945088.pdf
    • http://vencedor.coop/images/admin/file/42215047183.pdf
    • http://officinedesign.it/userfiles/files/89960252202.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b94dd617b9---98907675680.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79823390568.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40329af684---ginifileb.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/db21ed67bce0a4ab58fe27f8a28c34d4/tarulalovikip.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e49.bin
8504f8501deadca615709abf1b0ec664b8206b252ba8fdf01938105101be7cfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E49 16680 bytes
font_01_sfnt_off000155d5.bin
3851224665bbef9ee2837eae1c2a2a831fd0ed76dce72a64b9428ef97f376081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155D5 2784 bytes
font_02_sfnt_off00016199.bin
bf4d2a2dd12986f2370a07c597ebf2de87ca00db0ddde43396f0fa8ed7188692		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16199 10288 bytes
font_03_sfnt_off000178a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178A1 16792 bytes
font_04_sfnt_off000190b3.bin
5b5718964f35ef8dcf9ca049e1714f2c274e1281bfc32a63aff9a5dfc47dbbbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x190B3 18680 bytes

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