Malicious PDF — malware analysis report

Static analysis result for SHA-256 910447eeb2a512e8…

MALICIOUS

PDF

115.7 KB Created: 2021-07-09 07:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 482927ec5e7cdfe4792ebfa7f7702559 SHA-1: 7fbd61883f6af5dfac82767e7f00de23be2b0249 SHA-256: 910447eeb2a512e8b577017874ab82b3573263fc3d82a966f32233693496c777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites, specifically targeting WordPress upload directories, and also utilizes link farms on disposable hosting. These tactics suggest an attempt to distribute further malicious content or engage in phishing by directing users to download other malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://geniodelweb.com/file/zipudukaradixajilami.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a423269a0---ripafu.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/45946096763.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2a69fe1542fffc8267119d2cda5119fe/85537087154.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/29957178685.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e1e2246f1---matoz.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/47347304759.pdfIn PDF document text
    • http://abnicum.com/files/file/74064988289.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609034f4b9d83---20516365542.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/63348817979.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/wizuboso.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/20847767147.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a100d7256ae---tunonesanejome.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210621_FB8083A4B7113956.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae366ca435b---serukepeduper.pdfIn PDF document text
    • http://midel.me/userfiles/file/32279341328.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/35324760552.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/37478581060.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xorudupinude.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/redefugere.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210625020544.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b6fd4a6b---54723562208.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/bezaze.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/272214067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+real+jason+bournePDF 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_off000164d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D0 10348 bytes
SHA-256: fb89cf2e641e3eaa39dd928a41f99102397fc9e2dad09b3b369f27bceffc9d47
font_01_sfnt_off00017c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C22 17400 bytes
SHA-256: 557e7afcbebafe8ecfb06bde30723f2b4b0ba309ad03549d03c06acaac6043b9
font_02_sfnt_off0001a9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1