Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d0367a7a314c52…

MALICIOUS

PDF

89.7 KB Created: 2021-07-07 08:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 64c5503898684e1952031045c85a5135 SHA-1: b3faa28f0cc52f17fc551612022398fd75a31a4d SHA-256: 72d0367a7a314c520093638cba78d6d984f67053dca67cc9131a3f0c84b6a00a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the overall heuristic profile strongly suggest a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0c9a7ecb---3855056923.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab649877bf9---romulelasosozafilojak.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/h418kon193oc2ng7jprtc5vlk7/nevotozeg.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b056a2795a1142962af96407b4e4ee6/34982590311.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/80362231950.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/povafo.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/31540339246.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ge3adld52m8ese1ne3cvmgmot6/wetatamofivasos.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fdb9164afaec7e66c583cdf116d97c5c/kolomonakabekotawexizo.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5c79c0c74bb844990171e1eb035733b2/luros.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/tefenereza.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/a1f7da378d4ff8e97f5ee6758db7909d/jiwepuvuroz.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9c4f33d63da06f9186e487966e4d611a/49615637668.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/25941503720.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b834fb4b598---pexorizozikewusumegaw.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b4e57187c---womil.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/renisaten.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/sivowapiravijajuzabud.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a998e3ccf72---nujazaxupavi.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/78714201524.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/8f5662rg87jdjdat6dvdeb4fpd/wixozobixedizisimojap.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/t00hcrfrkc9aldh69pljhm8082/razava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=2020+sales+use+and+withholding+taxes+annual+returnPDF 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_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 16868 bytes
SHA-256: 2a77d47f314fc186dd2c83ca31c3e335d8afc6beffd75baa81eb9c7802393c8e
font_01_sfnt_off000127b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCF 10960 bytes
SHA-256: 0222cccb1214efaebfb075117e6bfa64958eb45676a67cb816a56c98b1f46ad8

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