Malicious PDF — malware analysis report

Static analysis result for SHA-256 1556996bcf492900…

MALICIOUS

PDF

243.9 KB Created: 2021-07-26 10:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c68f28a73eb88ee525fba47b322929be SHA-1: 799c70c9d9e7c43c91b2320f5a99c4955859eaff SHA-256: 1556996bcf492900ab54488bcba02c562fe6c1fe2864c34067c4f03dc92166c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the presence of external URIs and a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8822

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://travelinnsuites.com/nbloom/fckuploads/file/datunorobalisuba.pdf In PDF document text
    • https://topupdana.com/contents//files/ragaxutamewokerowe.pdfIn PDF document text
    • http://armanetti.com/images/86058821819.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/rupufejuranef.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd108c5ace5430a4097be8b01ccc410a/mutuzamizovegibolujofu.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/q3o2vspicsb0i2i3kirtnl0jgj/sulanizoxidasasifofivez.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78771c5e17---gafibiwupovamajegiral.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/28092542692.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/19760665246.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094abbf3c68c---93618239401.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/pumarumatujov.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff09ea245a---88757210370.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/f514c56e7a0199bb29bc2812ac62524c/xareduwajuzeputubiv.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/6c0dcbbe7c5fe378ea7cfbc60228d4f2/60282852564.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/febiradawo.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/fatuvul.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23ef1c8a9b---valofob.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210626_75E3D90A5AFEFF53.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8f2ee5c06eb750552387a3a1a155c804/91729130217.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/kuxizugiz.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0c7522131---93395028142.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/vcfv95bchullq1ulegv50u2tli/49241137534.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/56018378181.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608323e7adb3d---senusuziboza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=solucionario+recursos+humanos+mc+graw+hill+grado+superior+tema+4PDF 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_off0003595e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3595E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00037170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37170 20544 bytes
SHA-256: f1465a62aa5a25d2bb5d787e6a445aa26453a1faf841d81e7ba9c9a5954ecc68
font_02_sfnt_off0003a48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A48D 11300 bytes
SHA-256: 23910f7b84dbce632147e51eb53c6510cf66dba05c639af82107dfeebc5a6555