Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25a1c363c2b98dd…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 11:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b95b62bc3bd0a959509dc7f6d209b47 SHA-1: a29e287a872f2c47744eb6cfcac4d458f18cf345 SHA-256: a25a1c363c2b98ddb4303cd39abcb45cd1e1f0fa7f4f7ffae473ea3babf846ef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate effort to obscure the final destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7b8eb8158a751296995848c7e4c6e9b4/kozabujaji.pdf In PDF document text
    • http://energosol.pl/images_cms/file/29324284256.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/63049542518.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/29414310510.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/70613209737.pdfIn PDF document text
    • http://envigest.cz/upload/file/leruwisoxikuxol.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/sumomevotomuxuse.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607210402dd46---sizirufewazakifanebujegat.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/566501650f3cb9236d03864cf25fae67/30318397647.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120dd84f0e54---76602022487.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7143c236f6---69772732163.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/741f6c6cb7de1d2795438f072c4c2861/fujujovabuf.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/50093606464.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/guxefibegumofev.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/18005440984.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/50385328291.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/liguvozo.pdfIn PDF document text
    • https://avenue102.com/uploads/file/60219242996.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/vapafixewatafulojotufuga.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/68633459631.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074aebf3319e---97725493071.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/903f67de1b3f71ca4b463ac88307a95e/dusaji.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/totejelugububakinowuzelam.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/34892872953.pdfIn PDF document text
    • https://kimcert.org/E/file/53210564784.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/38565518704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pieta+signore+tenor+pdfPDF 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_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 18540 bytes
SHA-256: cd34bf8ef3f0d82e26bdd41304805ad4613d166f1ce9ee2f1b6132d48d509a17
font_01_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001248b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248B 10628 bytes
SHA-256: 268e0a605fd11277d8d66b498b27f1f7d72ccc6b38c2ed1599651072fec5b5a8

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