Malicious PDF — malware analysis report

Static analysis result for SHA-256 01dd26adf91f4796…

MALICIOUS

PDF

87.8 KB Created: 2021-07-26 02:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c8d2636aec82b0058bada1bed2fcabe6 SHA-1: 5f3c5452440d145eaf897eaee76ed16e475e0350 SHA-256: 01dd26adf91f4796d1db3bef86d7c2d597d503edf6250a3bbe68cd917a23f89e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous links pointing to compromised WordPress upload directories and the 'SE_CALLBACK_LURE' heuristic suggest a phishing or scam attempt. Although no executable scripts were extracted, the document's structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c5f79de96---wamawegetexus.pdf In PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/8ee04b6407df74abac1ea30ae72741ba/46675638393.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/79ksuo4ba6vlpnuo92jsthijur/folajikebalularafevo.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca46545a1---48931428486.pdfIn PDF document text
    • https://aedwea.com/upload/foto/10921935439.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f10fe4433---zobezupelibonu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/881d0d097dedd407da97ca7d2b69c98e/17636631506.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3258d68a955548a276ed51e588ae9d3f/9848942672.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb3daf6e5---73505898475.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/69909327657.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b0bc9135efcd8f813c330b8db4ddf1a/kemevukixaniteditu.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/nifufofajefutimofo.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a043ccc778c---vebomukewuzuxupumitafufa.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/ripupovinogafuxibadip.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/65660966067.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/fb1685f37ac7a93ac95ce22bfcf6e393/61894674932.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bc05v1upkorromsvkc67rah613/zewetubig.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fdca772e9---82983797030.pdfIn PDF document text
    • https://komodovo.ru/upload_picture/devazitokumixesuwedujupo.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/63567692922.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160819c7887810---lepomabinuwibufudizujew.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/14384260097.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9890746e0fe64dc1b0a7883c1dbb930b/zulijetizizetimozasamovuz.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/jibogadokula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+write+emergency+leave+letter+samplePDF 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_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 10972 bytes
SHA-256: 4b83de88b3b976aad080f730a6478c848291287be9ed30eb428c50a4321ab040
font_02_sfnt_off0001251b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251B 16880 bytes
SHA-256: 60a67a65167eb83c1cebacbdbf3230ff9e8c0d699042edc5554f0c83b9d0351d

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