Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f31117c25cf237a…

MALICIOUS

PDF

101.0 KB Created: 2021-07-21 04:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30d80dff0c365978b1327ee208baa7e7 SHA-1: d4144fa400260c8eda3c2b35d8c1243410ba6cf1 SHA-256: 1f31117c25cf237a17b29dec0e7d2e50eafb53316df8def5037db41d97ffdf65
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, which is a common tactic for phishing or SEO spam. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to manipulate search engine rankings or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 http://keyflounge.nl/userfiles/file/24074423765.pdf In PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7f81c7d22081e2c44dc8e8794a83f710/92754781752.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/lujex.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160853febf3d0b---danelaresarat.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70521473849.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b39402b91b8---sefoseziz.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/1587609437.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c945676f2---66521902642.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/38720792222.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/48662566824.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/gogupakemopovimovutekaze.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/0e03cc11596981da12b735d181d540e1/rejinara.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/70134628169.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81e5264ca1---likifonimiwevisatotuxize.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f303c2c5b8---fewezizevuseje.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c889d81f95d---sunobipume.pdfIn PDF document text
    • http://bjjiffy.com/upload/ranuwugopinuvujonekiko.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6f3b2ba6f2a7771cfa63eda30a92d664/1920824673.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609063aac300b---93665153111.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/u3j95n9nn5a3ba2u04j5bmjan5/18935394713.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/77386115495.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/jusibubosudazuzetunexat.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097959202b79---subavofujafagexirole.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160803a6aac01d---ronipodozawodaregudex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=5+importance+of+green+technologyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001298a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298A 17432 bytes
SHA-256: c866bfa7563a81a2fadeda8398084e776872d95f0c58402cc11007a9dcf050d1
font_02_sfnt_off00015714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15714 10912 bytes
SHA-256: 79ad95ec3f942c54672c7eae712d3ced23729b825524f67f064fa76a2182256f
font_03_sfnt_off00017023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17023 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58

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