Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb68966d71fd14cc…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 06:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed4e88be3f7f0b61bbfc3434102e2dcb SHA-1: 92dea321cf4db869dca9d4e0915715417ab4f48b SHA-256: cb68966d71fd14cc4bf5fd399d51809bedda840ae4b40a73b7a5aec20c282097
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm, with some links leading to potentially malicious content, supports the classification as a phishing or distribution vector.

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://educaholistica.com/resources/img/imagesck/files/56091907473.pdf In PDF document text
    • http://matchonusa.com/uploads/files/2820631689.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/fedavozoxutazarozikidab.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a2cc71cb14f829784d0d268a04d11655/womibeberegugosa.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/90702381596.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1a8a4071ac468eee2c0a14523849bfa7/87643500551.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/19647775762.pdfIn PDF document text
    • http://firegallery.ru/img/upload/jopiwojetojununapag.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/89991650128.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210901150613.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/tufem.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/kubuto.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/70864881428.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/mikutepedejazoxo.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/44854866189.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/67462326999.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/bujuxujuni.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137989826ae0---novuxawejozotexafuwu.pdfIn PDF document text
    • http://bakoca.hu/files/file/21214740950.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/15507330520.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/24964761353.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/pekokemezukubadobiwuwade.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/12487079980.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/50822953574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+summer+training+in+delhiPDF 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_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 17712 bytes
SHA-256: fd5faafe51c4e85dc1847e66585fc89ff0d9852c76e50475b707b7bf7e868668
font_02_sfnt_off00012cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF3 10776 bytes
SHA-256: ba275a0c10b780929cef4492486cf021e8d779d3f37fdcb94d76c7d237b97828