Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b88f905c5169e29…

MALICIOUS

PDF

88.1 KB Created: 2021-07-17 17:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 64362b62c21b04cf2f04f922976f2eca SHA-1: 3df9b110ab3c8dfe1dda1448ce87ae7626e919ad SHA-256: 5b88f905c5169e2914303c98d412660b7374a05d9576e7e7382278b1822b06b0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to direct users to phishing or malware sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://zlatartopalovic.rs//files/36848607357.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e65922026a27e156a4dd12f802b42999/81407590483.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f5c0cd2635ecc8d46611e393ab2f0c82/19215238798.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/3482312918.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2i9g73kqk5pdvkglp5rd9djen5/15791847953.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/vipazuxegudajawofijir.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/16042951906.pdfIn PDF document text
    • http://cartopack.com/Images/file/10049811203.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/16482929645.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/xoraxenobivu.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/114d5cb624c1dd026cfb00773e3020bf/gejivamu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa51c97d745---61171579073.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105260715192545.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/aqdako5p1iii1s2dh5erikjb91/kujofi.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/bewodijed.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aff30219b---55814106749.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/229aa876fbd625f68ef5012cb8ebdb2d/zajemiluzutup.pdfIn PDF document text
    • http://iccarrentals.com/files/file/bamebogolenebumanoroge.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/dozoxitabunirunumewinu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d31556e76---barogagun.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de854c8eb28---6428448246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=kim+desperate+housewivesPDF 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

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_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 16956 bytes
SHA-256: aa10e82339209db18c01af9aa47c9a9f26d1a044dfd826b5655648710bc29777
font_01_sfnt_off000122ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BA 10748 bytes
SHA-256: 62344cac3ed52b8f019dded4160f69ff31549f3ed82215e2b4044b7d70eca30b
font_02_sfnt_off00013b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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