Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecd8c2af9b9d710…

MALICIOUS

PDF

85.7 KB Created: 2021-07-04 07:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a32e6bd365b356d1465df24b250f35f7 SHA-1: 615a755fca68db268119fa7b7efe9978d38ab5f6 SHA-256: aecd8c2af9b9d710f869473f6b8e71aad08cd325a0f9cefde3bd4664e834992f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous external URLs, many hosted on compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/oovij7ie2qr6r0a7iaokcjqs93/mokepibufupajadovop.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794882ddcca---miwuvozel.pdf
    • https://hissekurban.com/resimler/files/navasuzapatubodo.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7krjsenar01csu17ivfbs1i5l4/79923883740.pdf
    • http://busankid.com/webfiles/board/file///93984567843.pdf
    • http://phuvuongcorp.com/luutru/files/84683805758.pdf
    • http://stjconsulting.it/userfiles/files/lofow.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/89839c65ba5a1853c6ca5e7a9843dc81/xefuzanepulerapolosad.pdf
    • http://agendatourvietnam.com/hinhanh/file/datakugukafiwaboj.pdf
    • http://jgbt.us/pds/userfiles/files/jokagutodewaza.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a60f7d38b8---94197630583.pdf
    • http://nyett.hk/uploads/news/files/71320866733.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/93835017573.pdf
    • http://www.hgbehringer.de/img/files/files/xojijutoluzisokukepisap.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c35b4870f---10254301505.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d18f384de525a6c1fac48dadd49ac304/59874649047.pdf
    • https://chaplains-camps.org/upload_picture/file/45581526620.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/u80ork3evheo0mte5dtq09m2gr/80430173046.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3cf45c03d---gafononexududujapagavugi.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160838ac8a7e4b---95323087468.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/t6lbdt9grv6au8dr67r984cea5/83030505329.pdf
    • http://alibabashipping.com/userfiles/file/pudifuwusevotere.pdf
    • https://mollis.rs//files/77275055365.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac911951b15---lejotoxitoj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=internal+organs+of+human+body+and+their+functions+pdf
    • 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_off0000eb09.bin
e870ab3d9450e7482a99a9b80415e6802c6a19d8e86723e763400b8a88656ca6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 16748 bytes
font_01_sfnt_off0001168b.bin
0fdf384fa685b7764e90e48afe69474cef79843e23b154bae193c2c93d70d86b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1168B 11372 bytes
font_02_sfnt_off000130c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130C0 16792 bytes