Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1d212e7cf036f5…

MALICIOUS

PDF

110.8 KB Created: 2021-07-17 03:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd72095462b1b7d0ca24c0a875c228b8 SHA-1: 218a77149c93235deeb9d045561d2e09ea77a32c SHA-256: ca1d212e7cf036f5ef4434dc6537ee3bd3b3c5e589b24b8adf1530d2b864d6f5
164 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. The presence of numerous links, including those pointing to compromised CMS upload storage and disposable hosting, suggests a link farm or SEO poisoning attempt to lure users to malicious content. The heuristic for a visual download button further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ankurgroups.com/userfiles/file/fumadox.pdf In PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070a473ce24b---90557780601.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210625190101.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c6d48a91f23234d94cc010230309bfbe/rozonodudalupe.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/vrc4bq72tckv2i1l3c601ckbti/xigese.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160edfca019722---girevagug.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cbbeba24f---37345091693.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/98217231681.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/nenh7fn08vmc4lt2ha6o2iq8ni/zabiwarurure.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/56988215112.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160934e887c5d2---76419685092.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5938ee15c91a85cef22afd5b0244bfc9/mekak.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/r3n8ubrt14sg0iodlg6ip53bi5/pufuxukatimederomew.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7815492f999e11e8740204697519e80d/tifupijugelijivejugo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a313995adf3---nonixe.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/400bac8b9aefcb12a1f7b28c7c6896eb/nebanolezete.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/6623912352.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/qitt1lrlh3rvpnsejnabqtj3e0/nopagasenok.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/49976444212.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ae2c189e1---sokavirakirimopajemupo.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/77658157821.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/26774777945.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08ba28fb8c---wokutu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928642b64a7---losisiwubosibonaguwijosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=3d+max+2010+free+download+with+crackPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 11224 bytes
SHA-256: 8d79c98803843fbcd01efd546f523e3f56e00ce6b07e0bbf4c316a1bc32df76b
font_01_sfnt_off00012800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12800 20568 bytes
SHA-256: f1cecefa658bc7d29d84805cc8d380abf11a99ab1e78fab3d8715e52f8b49380
font_02_sfnt_off00014b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9B 1852 bytes
SHA-256: 927fbd6e1fd2ad5d621fbd216861e776272280f09e6c77cd8cfba2e060b93c5e
font_03_sfnt_off0001543b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543B 26940 bytes
SHA-256: cc57ac0cfc72a8870e1899e70da0c4a58dd31cb299eaf1f1bc799a2efd19eda6
font_04_sfnt_off000194a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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