Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44c3629120507a2…

MALICIOUS

PDF

87.0 KB Created: 2021-09-07 18:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 773b601f39219fc9c146965f33534894 SHA-1: 539da1ffb8c98c2cf8c90e90a8baffe8a34c03dc SHA-256: d44c3629120507a25f232b7c82ac8ef26849b381837546d1c03d2046afa30a03
164 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to numerous external URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/4f32b21e1d098480eb601ad5f4562244/79940148004.pdf In PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210618201223.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/38823792726.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c486d24ec09---21015689874.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/jejesabokosamax.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/88717174987.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/mefepibuwip.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b8deeeb9f3bcf847938faf03724daef0/62518645888.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d56bb984e3---96330756802.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/71088767098.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074348e5d315---93144493897.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612893b6d1acb---10471661546.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/gezabidavi.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/88egrfrenrg298jb61jrfnc0ps/94716184669.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/wezizibaxosevixeka.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/lanexesubenozigow.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/jowawidal.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/fitopojufexe.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/e45cbf95ec5337812d0a56890d42d581/fopolijaruwuxepexupozuxup.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/74441914757.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/56654327396.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210706_125040_1496.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5b6529d3---63094443658.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/xobepetupuromilenojofo.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/3a45378ca70add69f847ef08f155233f/leremi.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ebbdju9j6a2rchmtglql6vn0ur/kuxomukotufajezigikid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=computer+quiz+questions+with+answers+for+class+8+pdfPDF 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_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 11516 bytes
SHA-256: b28cff9cb3148111bd51cec0563695c98f16a3a7573f8fdbaf81d2ce604ad17b
font_02_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 17860 bytes
SHA-256: e0e0a9d7555297b8585782952cc5c2a1114d2f14c5f14993fb0f8fd048fc8c6b