Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d844526587b59f…

MALICIOUS

PDF

71.5 KB Created: 2021-09-20 09:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9e6417a3728ce649fb88bc09895c6b0d SHA-1: 14585c90200fdbda7e809721b8dbe0d907591d2d SHA-256: f1d844526587b59f05c36d66da9c9a768e5891b9a820ecb418c750812b343afd
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple external URLs, some of which are hosted on compromised WordPress sites. The document body is heavily obfuscated, but the heuristics indicate a lure, possibly related to QR codes, and the presence of external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/fvl4bgm90hp60ocufpf7ahso46/46858012200.pdf In PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/22528151729.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/18010312399.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/voxajowogudanepudaf.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/73513072301.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/40677346473.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/tibevaroz.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/kenexojakirudu.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/11572430831.pdfIn PDF document text
    • http://saydersan.com/firma/files/xofuxikefikivevut.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16320750541376537603.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/871087840.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/kewabene.pdfIn PDF document text
    • http://reichspfarrer.sk/file/tomojakejesizixetemixup.pdfIn PDF document text
    • https://apelhijau.com/contents/files/98869829967.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/14399578919.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/rujinujegonewuzizosezax.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/xovadelujozuvexuxafipe.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/mukapufukizit.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/36702037681.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e542ffa7b99370c805585f1a4067b642/nitolokag.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b79a35fbea4f455b0a125006e8f578d3/tamawabin.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/52962419831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=barcode+scanner+zxing+androidPDF 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_off0000b710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB710 10616 bytes
SHA-256: f1223b01f5b9af3092286d49e2491cd41eb936070709407238e330043ac1b334
font_01_sfnt_off0000cf50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF50 16192 bytes
SHA-256: 54c067d0eeb902871642cea6c8c9e875512c6a1a5446ebbfda37f1a50fe20d98
font_02_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.