Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67ac140d835beed…

MALICIOUS

PDF

88.3 KB Created: 2021-09-05 05:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 37fd15df769c8e66a43895f797c9d8d4 SHA-1: 9698ed669343d2390e2370af9de0e5d23550b834 SHA-256: a67ac140d835beedbd8eef40e15420c1a068948d8fd030c76d34f67a9d9af8c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16088b456d86a4---zumaduvasebekiwixap.pdf In PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/jiwetet.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/kupuw.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/17857263380.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/nefotizinetimazoru.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/robezifoguvamigimevaxajul.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/12679807787.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079367b0894d---xetumiwukaki.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160cc74eb1cf89---43592520860.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/majupewomeba.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/suwejuzowizalomelubela.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b2dbeaef410daeedba2d7bad05406aa2/gazipe.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/75223331316.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39d95c0281---figonafofarobato.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/27145615126.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bucf4m1vh5vaghu16srtko7l8l/mazodada.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/90690774763.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde33e5aa34---refizugifutinopisiwul.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2852ad496b---98709412462.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/72780357138.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a6ee91aa---sunokafegedur.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/3876435968.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/litelozi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076948c36784---nunomesesapedimariv.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a0769625639---wawumuzevujaz.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/46701026310.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/aaae1ac907a41844fad4c0b9243f2335/mesonesodoxuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=epictetus+the+art+of+living+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_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 17108 bytes
SHA-256: dc24d2f30549c57d4af6770590835e09bddfd0f17b787fc04a5b1a379e8ecd4a
font_01_sfnt_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 11048 bytes
SHA-256: aa895b561aa11bcee62a34c80c0b5f7a6da6398cd318d038a7e2f5648239bc89
font_02_sfnt_off00013bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1