Malicious PDF — malware analysis report

Static analysis result for SHA-256 501cf1012ddd10e9…

MALICIOUS

PDF

102.9 KB Created: 2021-07-05 14:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8938071ca008c75e59e23a85216056d3 SHA-1: 157c6ed7f9792bec25b88ba4d11c314023bd2eac SHA-256: 501cf1012ddd10e99938b4f6db819f514e2f039e0c4fe2b48e69e571ccff12ab
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://aduanaldelvalle.com/userfiles/file/nugagalaxuzalanato.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/siguxapi.pdfIn PDF document text
    • http://chamdure.com/DATA/files/sivonowalulumosel.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d2fd8763---mojifesinafumibepipebete.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090f48216026---80097737628.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/rafirenetepozugep.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d9b9afac---jewopekofugawusino.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/xadevul.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f78a4f85f---90616314605.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/99004458454.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/gudugobixijevupekave.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baa66c32db---soliludisofezumux.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/91793383802.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/859b1794471bf7dc98e8f498f4b4ddec/xovuwukibe.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9880b44a---rixojejirori.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/vijefigaboxe.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/menowaveragejaki.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/42cd6e2f951de7832dbf660e6a8f8f0a/xesalavizif.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7e1a858af89bda6e21e557bc829ceca0/kizavepame.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609891a50c793---pobamimiwusinojinos.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3a62f0fe2---nawuxibiweweworopojapulil.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/57869567058.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b932726a0---kumadexibovekagebagudisan.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c7dc3287---mafowalawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=a+textbook+of+silviculture+pdfPDF 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_off00013072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13072 17176 bytes
SHA-256: c6aa182527333133db69f7da435eac5e6d07b2da9c512d0c96e4431646ab3394
font_01_sfnt_off00015d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D45 10828 bytes
SHA-256: 5416bc127808325c127c6a893eb405236c8d6f435e172c5e4c8943e55bdb0e03
font_02_sfnt_off00017644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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