Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cd47047727008f…

MALICIOUS

PDF

91.0 KB Created: 2021-07-14 00:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fde01b748d1efc3788b15286d7833535 SHA-1: 23247cfd1b49602f34989a9202708a2172625da4 SHA-256: e8cd47047727008ff240153803c83f13262feed1010f93413c8eeca31776dd89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded URLs and the 'link farm' heuristic suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://appfacile.it/file/bulejebuvokiruteni.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a124e2e471f---xadisafonipuso.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/53000680858.pdf
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/53995742996.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/5eace95402837dfcaf80b29ba9cce307/5404688513.pdf
    • http://meteosputnik.ru/userfiles/file/jozupokemosof.pdf
    • http://popnmusic.fr/userfiles/file/butalanadagulisasudibul.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/beadfa2e9906d5f4009cfa9b1d64124a/lonenosimodurisaj.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d833ae8dc---pokesoxetaluxaro.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4ea88c38c---81147033370.pdf
    • http://slstudio.it/userfiles/files/pidizokisewomogonum.pdf
    • http://clingac.es/d/files/puvijasutilu.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/bojovekiwokeli.pdf
    • http://ndt-tl.ru/upload/file/37339291388.pdf
    • http://ubest.ru/images/file/dawedaj.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8b8346e4baade701d16869a30faca8d0/kukojibi.pdf
    • https://psychologgia.pl/Upload/file/30510015727.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da0bd64ff---mokewikanupapisivekodegow.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf592458f0e---72057946432.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ub6ksjktkg47hrqadnls9h4kjp/79397447453.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ijg9lnluf3q8fc6fbhh0jk5d97/44015717453.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081046faccb8---kunubusozexisedozup.pdf
    • https://digireg.cn/upload/nuzojifoxoxa.pdf
    • http://thoitrangvabaoho.com/Images_upload/files/39694640949.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=star+of+barb
    • 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_off000105fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 16792 bytes
font_01_sfnt_off00011e10.bin
80f4db4f0e85403c30b8acd36c7169ed58872e76a8fbe554cbc374c599dfaa05
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E10 16916 bytes
font_02_sfnt_off00014902.bin
4a2d96ecdb7963c7b76cf3ee5e47594295281c120ef4b088b251a04a9d9dd41c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14902 9880 bytes