Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4c6ce064942da5…

MALICIOUS

PDF

86.9 KB Created: 2021-07-13 21:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96eb733274b258f3b246d0687b321bcb SHA-1: 91478b84d6fdf9479f643bbd3210974837841471 SHA-256: 7c4c6ce064942da5c7f4bd8bd0d664b843bbdf06dd20e212996a54c790da0278
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a large number of links. These links point to compromised WordPress uploads and disposable domains, suggesting an attempt to distribute further malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=dragon+ball+stages+mugen PDF link annotation
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/wuralifew.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/57443305904.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/zomev.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/19c0d05947e50930dea48ed3ef9ed9a4/85231066221.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/4e4fb7fe560dc915216afee96c3c6c4b/dawaxe.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021061610508_170319262.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/fulobabazetugevel.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/2ljc7qv2klrsiaqfpmlprq61rg/20619056083.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/65694238045.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6evo3mpm0cp06qlmulpkp00si2/juruseratuwose.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5c2408ec7---76445270648.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97d8dc8f6---68038335573.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/fovalunujezev.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848525b0376---5837125367.pdfIn PDF document text
    • https://drsaman.com/files/zalopedesilubefuso.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b252f179fc34368d974d9216ad2ac668/380739000.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/64f2466560def95cc4a9dfcc8cc7a0c8/27780007689.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc29d53dd8---12395037135.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/paferidavow.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/momesiso.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/ph23kf2u30003s6skcaq004de2/zodezuxenutulenox.pdfIn 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 18208 bytes
SHA-256: e995dba2f8da64634bd33a316a68b8bce055b0f40a222ebb9b575535048377d8
font_02_sfnt_off00012e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E30 10600 bytes
SHA-256: a6bf43e672ef0c20fede8d4f714fcf4d1949a42771f6608e282a9de5e6d0d335
font_03_sfnt_off00014666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14666 1660 bytes
SHA-256: dab79b2fd5a2dc11d6eb37fc3a216db411bb5cae5587d5ad9145acf34746c19f

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