Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30ca1370c47fd0c…

MALICIOUS

PDF

95.6 KB Created: 2021-09-02 01:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca01e57db53919132a8f06c41eb5a31a SHA-1: df2d6b4b6c6dbace59b4a94f548339ab718c2565 SHA-256: c30ca1370c47fd0c5ef5f60b19c11c4198816cb4aeee277facc057a416c87afc
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://maribon.net/app/webroot/files/userfiles/files/88810959043.pdf In PDF document text
    • http://almawred-sy.com/files/adminfiles/files/naxiruzatumexuboxok.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835d9499c7c---mosuxafizazo.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/xupupin.pdfIn PDF document text
    • http://rcot.by/pics/files/69175806716.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/butumenagitifimudedasonig.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9da61d3304fd8fd580ff0cdd5257dd07/resixikimeraj.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4165c9fbc99daa52eeca6bdbb56e8e02/lugudovibis.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/75999490124.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce3b98e159---20718264680.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f14e27adf---3570640260.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/87169876550.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade0ad5bc4a---kokogov.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cbd249b6d---26473646411.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/muranesu.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/56555950932.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/xupezexilekisip.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/zitugezenaf.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/949551ab1cf6c7ebf3d64e6a9670151c/10843080547.pdfIn PDF document text
    • https://tarsiman.ee/files/file/42405569396.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/xuzodinopululozotema.pdfIn PDF document text
    • https://norservis.com/files/files/vezudepokanulesozurujexa.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/6733482812.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a24ad221b26---58167987095.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/95346211293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=distaste+meaning+in+bengaliPDF link annotation
    • https://bit.ly/2nmfzv9In 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_off00011185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12997 18596 bytes
SHA-256: 7540679cd4094930c54dadade22620a8a14474112620c208b5f1d235499b0803
font_02_sfnt_off00015937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15937 10372 bytes
SHA-256: b9f6621d642f6df927655fce14deb4565220aa2aa98084e4584815126fe7ff39