Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff0297e3168196e…

MALICIOUS

PDF

99.4 KB Created: 2021-06-29 18:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 89ab06b04c2f50de87f5e5a9b0c580c2 SHA-1: b3d81556f90c81b374e2ca834364486b01b16373 SHA-256: aff0297e3168196efc83e130bb9843a4e8e611f474cb102243f0c985dd1b4350
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO abuse. The embedded URLs and the nature of the link farm point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/2bqlttig3e9imems83ba6dj859/kapawodebos.pdf In PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48f4c0249---51930293182.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/kidilaveworodekanoni.pdfIn PDF document text
    • http://surtek.biz/image/files/20150104_083842.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608026ca5ac08---xizekafivezedeximete.pdfIn PDF document text
    • http://apvn.info/userfiles/file/fedikemitafunetatavakami.pdfIn PDF document text
    • http://fields-on-earth.com/zazofasenaxatiwofuwu.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/52375c71e6cc06a56f736a25007b7343/xiregitomomagekeliji.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a49a3b12df---75264332427.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9f53cf06dff0d904d05b5ad6be9aea54/98156580118.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddbd1e04f4---mekebebuv.pdfIn PDF document text
    • http://swingdesignhk.com/userfiles/49460498552.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/64137966155.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/gupaxinom.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098434d683cd---xasatazekitotiwab.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16097aa068c269---54830410457.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/molerorusegeropulu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/246b636319d34e49b7e209d02b89ace3/ruxobu.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/kp0efqf3rk9823jdevlvplaup9/99564721674.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9e616bbd---17109837502.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760751b4be9---logizuxivomaw.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/55836165700.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/a3d9k1gimm12m0dv17efqvkc82/mafozivo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/rkalh1juqnu892orjkod3fga1o/18034593311.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c6916c392---powoneki.pdfIn PDF document text
    • http://giga.sk/storage/file/fogiroxekimoparotopupexuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cawson%27s+essentials+of+oral+pathology+and+oral+medicine+9th+edition+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015019.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15019 25368 bytes
SHA-256: 7736a490131b65ceab7c5314c8c0366c255c1a58132d42c077387d2b33e4d609
font_00_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 16736 bytes
SHA-256: 91dfcbbfe7cecc0d4fd867c6968e59af9664999148e51660a8d5717d7958188d
font_01_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001351b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351B 11500 bytes
SHA-256: 27805c4c7fa7edf5b930ed9d95bc001f09bf2fbc65503fbc7a531ac10be4cbd4

Open this report in the interactive analyzer, or submit your own file for analysis.