Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53b0abc9b7fbf6b…

MALICIOUS

PDF

140.6 KB Created: 2021-09-01 06:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07cad39c267925b605cc3c6f49f9fb4a SHA-1: fb1f033603e9c7bff5ad6fcc1939110fc12b9668 SHA-256: a53b0abc9b7fbf6beaef10d86454a0065ce6f83e62eaa0fb23df9fa0f2e72f3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://soft-pro.hr/upload/datoteke/nuxarovixevimixawub.pdf In PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/8e78a5f339c2888208604925a27a6ab1/81784453304.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/0d52158faf48de99d85294de15bac0df/11234201569.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075faa09b962---51953433774.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/33043795986.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5ba5a3386---29763964737.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/17714344465.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786a14e87b7---xomezodopumij.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/38856779622.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/15530572270.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd7ee5eb6d---radutelazawoxidesepudoba.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/fefam.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd59a8fe61---numibovetuja.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/tizaxofiz.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/98710415381.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/55690354607.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/24f417397058e398763dcb6a5d6fb71b/saxijizudalo.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/89179817241.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090bda843ebe---vofoduwenesidavosig.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/koteg.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/68719584236.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/91930968959.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160837c6f9961d---23825875423.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/p2nm01kl3m19o9o3ph91umu6no/67481845706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=arid+in+a+sentencePDF 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_off0001baa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAA0 10180 bytes
SHA-256: e717f6faec4dac6c3533f1f458b1f2b995cbb3752c9e51ec262cd2f6195c29e9
font_01_sfnt_off0001d186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D186 22600 bytes
SHA-256: 4e15081f561aff3cbf67dc0f63dd9969982aa1829013d3f329a4d3fc0032bfd0
font_02_sfnt_off00020c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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