Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d5acca82edf023…

MALICIOUS

PDF

87.2 KB Created: 2021-07-23 21:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 69eef37cc55fa32b8bc6d6cdc003ee8d SHA-1: 5b8936069f8c8a1b4ec117200386e8dff2b3f8b8 SHA-256: f4d5acca82edf023b2d7cf5f079b3af551a5502d7a715d23babfe6a6023987cb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da920a20d69---87022525855.pdf In PDF document text
    • https://martabaktelor.com/contents//files/nixiferovozasiz.pdfIn PDF document text
    • http://sam-global.info/files/file/gedipijajagazopiredo.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/81096671989.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160711c3f97943---tosupojemulipozafipobofe.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/geotbdvp6mavcgf64v33t538pc/99637244436.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/73201999102.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a026c23de16---vesuguditolimo.pdfIn PDF document text
    • http://renovator.cz/files/file/92267645030.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3b9e78d1---mujalugogelosigexosafife.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/98758884191.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/7fe56ede471f0489e32b6a0ae7234e8c/89792961711.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nv39kf5ue3s8dporihq4cissm4/labamebul.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/sowufemoruzoximumaguz.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/40166033291.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/82055854460.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/06c04d7d4a9d70929516d16f35779244/95121093853.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9melh32r9o99h97jdmhinqc3o2/51182026531.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/de60d06ade6f953185f8e524aec2c73d/rawixaw.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/450775a9a88330359361dfdce5117fab/96028342469.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/0g7hddg9t2v8evpeisi3j9opj6/tuponezuza.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/fexizevaxukalufajemot.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607576ce2f0b5---pipokixerifav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=adjektivdeklination+mit+unbestimmten+artikel+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_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 18760 bytes
SHA-256: b0cd7317346c2b0e4554d04aafec572c79ffcce660ed2c3e98727e3aa317377f
font_01_sfnt_off00011b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B11 11168 bytes
SHA-256: a0155f7836a87c2f5da5a227a0cfead41d4b938d1bf1ac8b4b582eb3cb79e1f4
font_02_sfnt_off000134f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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