Malicious PDF — malware analysis report

Static analysis result for SHA-256 efee53cee6d042b2…

MALICIOUS

PDF

89.8 KB Created: 2021-07-01 14:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 299a7fe20357a0acd7ee35a08f9ce37c SHA-1: 9e914b54214b4e5aba07cf6d49c80c3d5ffc8783 SHA-256: efee53cee6d042b23e0a65381b662bddf25f23f85433b56b92aaf3209fc8b4d2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://arichaindia.com/userfiles/file/fubuvobinu.pdf
    • http://silesiacapital.eu/data/file/monawuvubewut.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac32bb3d6---81578570267.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/7e75fc217d8ea700343feceab1d26817/pibotudifadotog.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45da90a725---53720260366.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/adc4b199cb83c06fddf94bcdc7ada619/sixiwejafefetikeruz.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/81954665722.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a96ed34dacb---26688933324.pdf
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/15704652435.pdf
    • http://riceart.ir/basefile/files/94645231920.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd0e15242---28417839747.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f5681732a41c7a5fd3cdc88b5c931324/96482127923.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/u2et8p9tsgk7rh6diccdrbhf7b/9372081428.pdf
    • https://tsafar.ir/basefile/tsafarir/files/61644285899.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074089b75119---xagarusomut.pdf
    • http://azizolace.cz/images/file/95488031096.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1778a6749e---xulevekedamekegudokat.pdf
    • http://kaushalacademy.org/ckfinder/userfiles/files/25893567149.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6544e5b07fd2ee86833939d83465ba36/35236652537.pdf
    • http://angelcabrera.com/FCKfiles/file/45340205826.pdf
    • http://greenld.com/userfiles/56055253996.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-16/20210516195010491731.pdf
    • https://advantagelic.com/singhania/downloads/file/2253881795.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe0fb08cf8---pozusipubesozevusexaw.pdf
    • http://fecirturizm.com/resimler/files/jesozolefiw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=stay+with+me+one+more+night
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 16792 bytes
font_01_sfnt_off00011310.bin
41b747e005cdc34c2bede9261fd9b11da1c6bd3b59c3048e5633855c4d6b5733
pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 10616 bytes
font_02_sfnt_off00012b38.bin
8079869e530be445bab906902e29a60a4582182ab7e42d20fab1815adf554d5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 17764 bytes