Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84ea5e3905f2482…

MALICIOUS

PDF

73.8 KB Created: 2021-09-27 23:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7faa7b400eca49b2898826571f583327 SHA-1: 12a3bb7f9787ad600d6f1b7c18018743e92b64cb SHA-256: d84ea5e3905f24829f6b487acff127deecd7f783e8ea43c86c70b448ab217420
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this PDF is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://irlanc.ru/uplcv?utm_term=mqtt+paho+android PDF link annotation
    • http://huonglonghotel.com/uploads/image/files/zuwonapedetodi.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/zeburikoforez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ece8e4b50---gojulenojinemeziton.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/47858256995.pdfIn PDF document text
    • https://geloracinta.com/contents/files/zaloselikemunexidubu.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/41768228807.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/bawufajorejig.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161419b1acfd67---8028715672.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/domevejanokofopijagugekab.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/xolewewo.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/41250798185.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/82159712057.pdfIn PDF document text
    • http://fohow77.ru/upload/file/bofufusafazutunol.pdfIn PDF document text
    • http://goodmax.ru/i/files/18585691055.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/suwafuzaxanurunipagukup.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/vejamalow.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2910f6cf---devurezumidogi.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/12573813700.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/supovokugisexisasub.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210919140754904894.pdfIn PDF document text
    • http://emeat.ru/var/files/94347149983.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631987256gasibixiwafibu.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/41702761138.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/35811553502.pdfIn PDF document text
    • https://efnnma.org/files/file/wugewifazowera.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/38877517385.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81F 19540 bytes
SHA-256: eb1883bc8faa864d6f6052500548ae3aba14a5b2c718d718bb129c085f91a4d1
font_01_sfnt_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 10280 bytes
SHA-256: edc906c5dbc38655386c254efc41674c9e7c11ded0746b76ac9708709bf1d8b8
font_02_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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