Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b6a11838dd1239…

MALICIOUS

PDF

95.2 KB Created: 2021-07-01 11:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 14395634c15dd8a009b435d01061d219 SHA-1: f06ff968bf65d54f80652aa8e46c0f8f18d5970d SHA-256: 85b6a11838dd12391f247fcf331965c13422a8a2ad02b76cf11deb321aa51521
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body was unreadable, but the heuristics clearly identify the PDF's purpose as a collection of links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1b375d4c7---56533165306.pdf In PDF document text
    • http://limuzine.md/userfiles/file/31444427.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/81246272945.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/a7us32d8hre7lev8o9e8qg5di2/52245657049.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160791eac61d2b---meluve.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8807943f6244a997607f25a4c2c47f5b/gizasojexedidikosa.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7e651337e9ffb6e9fe5aa200558203e2/segedebeluvenegoro.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/lebp56f0pck8oi5rnihdr93f9u/xalixefusaxumi.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/37cq2t93748rmf7l8prh9pv996/lerufabowewapebigimulufik.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/0d2d719b5c55b329921865d1335b9c35/zufaxuxaniz.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/00f148fea8439643dfce68cf42dc05e2/75607379365.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a6112e268be71ddd5476588e959a8444/lalej.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/fabuwiwivawanelolosaw.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b06777b7368---62614505107.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d93ed2ebca5c667a7d28af42bb62099c/taxugabaj.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/palawulamelakepirij.pdfIn PDF document text
    • http://korytnica.net/data/files/72502712325.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/35741072747.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3241eaf2---38916021365.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7ec2eb26aebf48c0592ba45d48243551/faxipepimidaruveta.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/72906452508.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/22967474514.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/towovabizigixemisekewu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b770177d4---zivixos.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/18472015955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=connection+booster+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 16308 bytes
SHA-256: 3a0166967e87b3fd2628e587bd9c05f73f886a1848ad477c83364949f37d8f09
font_01_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 29108 bytes
SHA-256: 4cdaba9c520dc2a8d317c7182ec4775ec03288e6acfc4ff4427e7168fb304202
font_02_sfnt_off00013cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000154dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DC 10584 bytes
SHA-256: ee4d7760ece5a9db92d9538b9950abc2d33de8dbef8e69d5ea20c91dda951af3

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