Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a42136e95daa23d…

MALICIOUS

PDF

91.4 KB Created: 2021-07-13 17:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fb073bf480b1ff84537860a6b130e1fd SHA-1: 34c357adfc662d65a86f224d4f4a65e8da0786b6 SHA-256: 1a42136e95daa23d2062382d5116546fe2289d84afc8e72a5e85ccbee215ac0d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The document body was unreadable due to encoding issues, but the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/0hlsgvrg0viad8lt1pgj1tios3/38207101248.pdf In PDF document text
    • https://sluganarodu.org/userfiles/files/dixirides.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/68376216fd8362a4606bef9c9747cc59/libonurifap.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23d766cd0---87977898339.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ff90bfac7---vonejok.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/45f3cd5bbc9eb07b5295a2137376f36f/76593314357.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/krr28olm1viud3rd7r7n5lcfe4/93954705300.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/tawipunumawel.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/gulupetufimojiwowijo.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f07b310d1727c07bdbf1a87bd487502f/golonumageve.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/43219047532.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870b4696152---28620721299.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/19f15414c08fa845537242a9d179c6c3/6005409692.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8950ccb75d4114826cf4ba929d1c311e/baxamuwojujutut.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c361dc4157a0ea0d98f0d205d07cca3b/88468287367.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607271a9f18cb---xitodo.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/u1mqq15q8bnt7a5fd8t2eo3m08/xexureradane.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/krvrv937ivfo346epajt6itg2d/75358901876.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/3559058612.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/13019148587.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/mumiwodoriwomedum.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/15818981695.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b98d3a0a3---22557237060.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8400acf53---xipuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=2+point+perspective+shapesPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 10512 bytes
SHA-256: 7582b0b640200f12ff05e3d21f7b5e3d8d0c3b873af096d62c595d46f3168b0f
font_01_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13038 17772 bytes
SHA-256: a436c0d5890fd09dc5688745335909f19d85d958787629f7e59bf2ada62fe10c

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