Malicious PDF — malware analysis report

Static analysis result for SHA-256 a870e03f09beed15…

MALICIOUS

PDF

93.0 KB Created: 2021-07-28 11:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: afde2379572132f72bd7d036ac89a168 SHA-1: 827992877b8f50f43bd45f7fce4800b31d3ae220 SHA-256: a870e03f09beed1539d9f714666b865af9d1c91261234445503b68a649d5ff4b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the presence of external URIs and link farms indicates an attempt to direct users away from the current document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://trungtamgiasuhcmmq.com/uplaod/quangtri/files/4210903233.pdf In PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01e5f01dd---17342611603.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/df57f37c55804d95ec983a263e4e45f4/devemoxutogojuzepi.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/pafagoresuxe.pdfIn PDF document text
    • http://palami.by/images/file/99023932222.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/dizupodofanudatosa.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f75d9a25f---nubezubanubirezazabaxe.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/seneju.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7dafb4745---48628245372.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/54777250034.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee881c10f00---vaturedagufunipulakezire.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4fbecf307---turenekizabekuxa.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/1b13ad91ad6e2790da6bf04b935f477b/xirosupadikonud.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd10369215---gomul.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/dba283c2dbe6f39a60fae3ebeb3556a3/78768178761.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/tozivat.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/jaxapagox.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/79330552010.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/61135567974.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/11149607723.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/65845268889.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/28071448710.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/vupamopufixuvunelad.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c3652dd1d---jowelawemugikileluworag.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081fe39e2025---55698849938.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160765c024b8a5---57478311224.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/1728098665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+use+metered+dose+inhaler+with+spacerPDF 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_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 17352 bytes
SHA-256: f04fb519df6313f1b90af3f9bec8a617950a9105922704a72b31110ddb1dd2b9
font_01_sfnt_off000133cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE3 10956 bytes
SHA-256: 4a00215790fa5d682f8d373ab50d5bcf64e5eae8dd3d98f0906ed319c1b78fe7

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