Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45cf5877ab8465d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 14:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c6e4668940c48f33bd64fe24b5733af SHA-1: 61c324ba7e79790557cb9f4afaf58887ba0e64e7 SHA-256: a45cf5877ab8465d3a08f1a5f9ed84439c852b2dda571e9ea73658524783396f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=lonely+planet+cuba+travel+guide+pdf+download PDF link annotation
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84b77ba4a---dedurasojuvatiketanutel.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/532620741.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160748dca5af53---58925400098.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8912d04357---2396814998.pdfIn PDF document text
    • https://medtek.vn/storage/file/15596145585.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6972a2a4b---50765691674.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/wesarexu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a961eae3915---zelib.pdfIn PDF document text
    • https://tempegaring.com/contents/files/kamevabeparagazetemu.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/73641520612.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/gelararirax.pdfIn PDF document text
    • http://liyangah.com/Upload/file/fubupawipodulotonak.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6bf47d11dcc31d8e09f367448b0ac92a/79354536782.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ac39c4c87---batazix.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/fogowu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e386446f9---welajoxisewuzana.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/46750888737.pdfIn PDF document text
    • http://specimport.by/files/files/makafaluli.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106d71538593---66952255216.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/nepilenuliwamak.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/70286337887.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/57272437462.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2cee247d761197a0852e64502a8a1f38/jiwulobodolo.pdfIn PDF document text
    • 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_off0000db78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 11088 bytes
SHA-256: 742e1b57fcc638b1891796e7882ec660f19379c0d73890fc6dd8b80cdb5eb361
font_01_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 18564 bytes
SHA-256: 351808c705c2973cf469930f45d3fa24fe0524190c5da66b111a1f7780947bf0

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