Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82eea75e4fd0900…

MALICIOUS

PDF

84.4 KB Created: 2021-09-08 00:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7af3adcdfe0006f9cea30075b3880fb SHA-1: 98bb40f7b44fd4642d86e3b1bd4c9be1911acd78 SHA-256: d82eea75e4fd09000ba77a394920eac6ad932e9dcda285da3090b060afee2248
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous disposable hosting sites, many of which host other PDFs. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://446888.top/userfiles/file/89458652545.pdf
    • https://pecsikult.hu/files/file/73429676907.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/96026300356.pdf
    • http://mywayrtk.info/userfiles/file/172668701.pdf
    • https://baongochoa.com/upload/file/sekifovusemovigofupiwas.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/0m84oggg0erqdifpp7me9gpq35/ziwezumumujip.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607217ebddc37---25556595841.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111558f1cf6f---gizogoxapelozabavom.pdf
    • http://didocrosby.com/imagenes/file/tefukuzodidi.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/79181907657.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/7327ba7b8bf3f67678395a22e686d285/jeberolinopodalan.pdf
    • http://jun-travel.com/userfiles/file/tajexogaxi.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9766b617b9---89157208376.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/xewoxitiranobatebe.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081cccebf27c---lovozuleg.pdf
    • http://willbramephotography.com/3891664733.pdf
    • http://yonseri.org/userfiles/files/69575742081.pdf
    • http://pension-erlkoenig.de/img/editor/file/33436714591.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b50e70cc---496342970.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3dba0678e---jemekaketufebesobakejumov.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bagamugekoxajufakarofubi.pdf
    • https://quaint-house.com/88096574968.pdf
    • https://motiwalainstitutes.org/userfiles/file/pirinozow.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5a7214ca9144fcecb0cef2896a559c4c/sakijowebok.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=nuance+pdf+converter+professional+6+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e407.bin
ef06ef0cfc993c6b1b6fff95b318c72cdf37c947ffa692b116234899d0c3fcff
pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 11012 bytes
font_01_sfnt_off0000fddc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 16792 bytes
font_02_sfnt_off000115ee.bin
0af8211dc4efd659c84d314c1d8d17c2eda6e40a064a2d472d149545cbed1f40
pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 17460 bytes