Malicious PDF — malware analysis report

Static analysis result for SHA-256 f701f914864be81c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 19:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e518aa01b86c53678558600bfa51c3c2 SHA-1: ff4789553b6ea5a96297096c36eafef75c4b1396 SHA-256: f701f914864be81cc78fd5415b2417679597647f7f146b1de240597cf22e0846
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a clear intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://medvor.ru/uplcv?utm_term=diy+chicken+coop+plans+pdf PDF link annotation
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e7b585447f71f11f506ebe4a2f3ac563/98677886640.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822fc0edb4b---pubuvasumaxorufegonebef.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecacb187ae---waduxazukinos.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/fiwewego.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/87329599974.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b7297718908---vufunimejibixeraze.pdfIn PDF document text
    • http://ciskmv.com/css/file/72495964065.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1c92578a---3029959529.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/vukarol.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ntlqe9o2b1rij4f1bag3lrmu63/49409828010.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/hj5ihdta0dh1tcg0blq8geiq1k/92783925179.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/61287748599.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/9fa47ku5spst5h1vjfas97q250/61059899370.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/87004156959.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/96348445200.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/65a9b1a0cf4e8084aeb032d9c020c071/28503090795.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/xesibixoxupolarimix.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/foratapi.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/2aa7f0e02b7071c98d55d117ed205175/11729218224.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/30722357970.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c5c300bb967a24f603ee9c05c277895b/79926624541.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/9fc07aae12ec2fcd2cf6ae564bf80ab1/48403640142.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/kusikunexuxubebaluluda.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/61102121794.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/44129380252.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/92516727381.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf23aa4466---55513483228.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_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 10724 bytes
SHA-256: 9c1f5e0efeaf5c86ff8245d0195e3bb57b32da3ebbbdadf36040febfb87f7edc
font_02_sfnt_off00011596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11596 17596 bytes
SHA-256: 8af598fe1014f058b4fbae073ec94491aec14b3931ca8122c2f4043d4d99c1af

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