Malicious PDF — malware analysis report

Static analysis result for SHA-256 81aeb2a897f4a0cc…

MALICIOUS

PDF

86.6 KB Created: 2021-06-28 03:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 201007dadda63a9a1ad4447c4cf96bac SHA-1: 0fb0997c6b7106cde467c54fdbf38ff084288eb1 SHA-256: 81aeb2a897f4a0cc2e40263bfd92e2c129b0d51bc402b8a5324157acfe8ba946
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that point to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The document body is heavily obfuscated and unreadable, preventing analysis of specific lures, but the presence of multiple compromised hosts strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://betenagro.com/sites/default/files/file/jivupuxemefizujarazuzonox.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c92bd5f618---43413279236.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094845107018---20671219604.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/87fac43d18c4502f8579fdd1dc1b6589/vefegadebofasufar.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae8be9b57c---33673387047.pdf
    • http://connect-senior.ch/uploades/userfiles/file/59245952485.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a639d997---sojemavegemanano.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/22c09efc0cbfed5d74c5cf82f7dde35f/52948676190.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc65ed6e052---31203393935.pdf
    • http://acpiindia.com/userfiles/file/97620180412.pdf
    • http://safetypath.net/cms_images/15365292921.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8deb9a5c02---fulaturarurusoxijoz.pdf
    • http://gocreate.termall.pl/upload/fck/file/29090149468.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fe2cbe35d---92492385485.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160827be6a5003---27814654089.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/7602332150.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1dd39132c---77094426194.pdf
    • https://ridersshop.it/file/sezibikinuzozesenapunixe.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea42940b00---23337861046.pdf
    • http://daisytalavera.com/userfiles/files/28809868795.pdf
    • http://taiwanglassgroup.cn/userfiles/file/mojiwaju.pdf
    • http://biomassasia.net/data_ed/userfiles/file/76971219918.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=general+knowledge+book+online+reading
    • 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_off0000efd5.bin
f3f728673e8da9b5b0ff30f9d8438d4ec74681c46bba4af9740132345c45a163
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 17400 bytes
font_01_sfnt_off00011ccd.bin
3f3dfc40b211a3606b41a0cf415d40eadf70d08d2a57b7e74f0434809dab6ba7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 10512 bytes
font_02_sfnt_off000134a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134A3 16792 bytes