Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a1adc0aaf9553e…

MALICIOUS

PDF

92.7 KB Created: 2021-07-22 12:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2e717ae59243a612e537d43be865fe52 SHA-1: e7df2d063cd135c372c3d26809c48fe6bb00198b SHA-256: d2a1adc0aaf9553ec470deb7d6a239061894a1a968c4885f69a2d3c9f6dc8007
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to potentially compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160725126a3311---59218868801.pdf In PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/lupubunuxag.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/zuxizafuw.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/78de5b389c2370a88ac8979bdc7677fb/valixegiz.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/23686929824.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/zerima.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nojemufirolowazarodak.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6b5aeb65c32fc21f7713d833b7365c14/10380557617.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/57304497272.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/pelisivisesogonogab.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f339339ae5b8a180a36645b11c0aa8a0/lozezenigebatimisom.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/48714045142.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aacf3daa14---sabomazamuvisaxixa.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/49571642295.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/rabawi.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/2f454f7fc2d01be6ba1a0093a3608664/17180008927.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e01fcc0725---33518208307.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/26355675682.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c851182e041---89721757050.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/toxelibatujapisubido.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160958846810b0---lonenizipumodixome.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/f32325b1ca05284e86fde8d578ad1db4/63705882354.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6a97d1d14---29921448571.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608dede7d1c8c---43777056734.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/pijifutarodukixi.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/78526105528.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/zesipazuximogax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=salmon+dip+with+cream+cheesePDF 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_off00010409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 17572 bytes
SHA-256: 8aac4989ec0918e48bf08df936c857d456ac18621edf590a373c991d912e9a7a
font_01_sfnt_off00013260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13260 10940 bytes
SHA-256: 145bfbbb25382f204d9083e7bb94ab01ca1ad7df2c9be5428a9be7265b76464f
font_02_sfnt_off00014b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1