Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c753cd0c5ea8cec…

MALICIOUS

PDF

95.8 KB Created: 2021-07-22 04:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 65e23ba2fb69cea1116cfa20b5a4ef52 SHA-1: 46aecfaa49b8d50845b0652b459781cf502760aa SHA-256: 5c753cd0c5ea8cec3de0ab7b0c612188b4dfa6d916e0e948d98286547114f684
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content or exploits. The presence of numerous external links, including those pointing to compromised CMS upload directories, suggests a phishing or redirection scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cakenepal.com/userfiles/file/tezuzigotufufusopom.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/donusewawobuzepopaxazo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rakimikevuneneluno.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb8b6bd53b---98823151183.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/wibusedigitemo.pdfIn PDF document text
    • http://usmleworkout.com/files/file/gazivozurapol.pdfIn PDF document text
    • https://aashianarealty.com/file/75360238067.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/jpioasfe4pp6vst3gqt2a61mf5/22265336530.pdfIn PDF document text
    • https://loctra.net/userfiles/file/22000773416.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609e273b92742---85714479502.pdfIn PDF document text
    • https://filetorme.com/upload/files/xafurodexavel.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/58068885834.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/41368369529.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/4842133208.pdfIn PDF document text
    • http://ned.ru/uploads/files/wuwuluvupuwepunot.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/27099574916.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/nexabefifilejopoda.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/nikag.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/52334pmc1b0esgurgc4ecuef7s/sififabuzaxata.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3af9b3d115---taguvopa.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/57738684571.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4jfosf2n5bituu6r4sqefk342u/bozowazodejugokarugumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cambridge+ielts+book+8+test+2+reading+answersPDF link annotation
    • https://youtu.be/ihi3hKeKX4In 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001101b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001282d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282D 17984 bytes
SHA-256: 8b568be2e616c3e30337a9d237685acbf1f49c8f42c451a7c2cf30672d212dd2
font_02_sfnt_off000156e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E9 11268 bytes
SHA-256: 80542e992320f6cebee288dedf9621bf143bfda7210c111dd23380a2c1112873

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