Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b906daf5acc8e6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 00:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94d1a52244d7edc30a14b9196bacef96 SHA-1: 7206a550b2f95a36122a61d38b04fc34d22b64d7 SHA-256: 81b906daf5acc8e6a53a0e70f2222bbab2b87195a4dc5085f2057d05644e5ca7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, specifically leveraging WordPress upload storage, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards an attempt to redirect users to potentially harmful content.

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://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136812d1d638---fosajupufi.pdf In PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/fosorerijadafunigolagab.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/tozuwimolomejotuzavawera.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/mevibizusi.pdfIn PDF document text
    • http://skisun.it/userfiles/files/65512832657.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109071808359420.pdfIn PDF document text
    • https://armenia4d.com/contents/files/notejulazexivagobezag.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/4858834520.pdfIn PDF document text
    • https://lordoptika.hu/files/files/vubojosawogifutizopumup.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210903122946.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161310b0ce1384---nirimamipewafizisuku.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/jafigupukalolov.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/putalemesisorogasolag.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/regozapivafumupobotewaru.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/tbks71pvvt58a13acapgu5kt33/32946496361.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/viluzamuwomow.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3777502ae18795713e7180f1802298ae/84649378722.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/muzemavupewogoxifabibeto.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/28672885974.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/15972274397.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/gaxofovo.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/93919443147.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/keked.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/zalelagefemerewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+install+two+same+app+on+androidPDF 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_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 10632 bytes
SHA-256: c4503078f6fdaf429ae636e900f33f839572b4bdf692a8b576ab2671e6639afd
font_01_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 19216 bytes
SHA-256: faefd0338a803f8f54ee58d259204f59da84da3457e079aef9f2c0bf847f042d
font_02_sfnt_off000123c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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