Malicious PDF — malware analysis report

Static analysis result for SHA-256 830d42a541c42439…

MALICIOUS

PDF

90.5 KB Created: 2021-07-01 17:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 38d3c9e01999aad72a6e7a8927976ade SHA-1: 0cf88cb1873e362624a685ccff4e6bc7b537aba1 SHA-256: 830d42a541c42439e3f325c3c90d95e7f8bd452a9b0673642aa451aad40f8807
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, but the overall pattern is consistent with a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/c1m7fe7h9srb2qkn672dnb8cb1/68281830439.pdf In PDF document text
    • http://qtjdb.com/UploadFile/2021/05/23/file/20210523_191429_158.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/wujekafiladix.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/7f0ff1aa411ccedd0c2afc168ada5a4b/talepajatideso.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160785866c19b3---62167856955.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9e95bae30---pivesejani.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/6affe5f5a663b1314ab65f58107fc9cf/subikobekitotol.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/us1ij7clhj3vgk03v334frt2dq/fojaribofupu.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160774ef3a23eb---76220837401.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/dinobigulowofaku.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/mbpisbgrurr5bb4o9riv06pf2g/divovawuv.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/zofudilibitexe.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/mfraqi6apl47nrekmruvdqfn97/gozoninemixiduno.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69ed9f595---20562067925.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/gafumiro.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/7eqcfhi9sbgnn3dtti13i2otpf/18252785369.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/3378267188.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b409927429---17189068858.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/18112aba33a235bd52ef3deff68fbc9c/19599582347.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/vetowap.pdfIn PDF document text
    • https://nevisnews.com/userfiles/taxurofitofaxurakatum.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/lovavejugowifidiru.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4f810818---13791207367.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/h7lnigj6fvqm8i5b6fie2v9ao1/73828440745.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a11fd72882---lurexefopitapimerowawan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=epidemic+pandemic+meaningPDF 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_off000100c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C1 17616 bytes
SHA-256: 6169e1cfa166e8c537dd571795d11f26b8f293ebbd8a1bbb276096ffb970a315
font_01_sfnt_off00012d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14585 10308 bytes
SHA-256: 93e628fba23267504ed80f315b3aa298be19baff32327172a11dfbd5da59b461

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