Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e288192c060098…

MALICIOUS

PDF

93.7 KB Created: 2021-07-07 02:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 955b1a934c18927c0bdf5de7b834a8be SHA-1: 64cbb475b14fb149bf2c93c450141126de229e88 SHA-256: c5e288192c06009875498069448aa8711d96967a688217301632595dc841314a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting domains, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://fidelishospice.com/ckfinder/userfiles/files/goxapetovoruwelevazon.pdf In PDF document text
    • http://vitacanes.com/uploads/files/18913012919.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/5vtk19e6llic9cjccv18gcp6g4/gupigupesitasutejiro.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/gabosuwejejazininetitab.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/140557947.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/vuwugekefefejujadazojawe.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c0da3652b0bae88741db1fb81a29184d/4907571301.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/724a496fd26e5b1b5d5178be286c9d81/limorolawemirawujobive.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2gas7oojppqpfo9ebphnob5ank/zetik.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e9f461453---kojan.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/c69cae194d29e91cd8c08bdc1635a300/2228734645.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2bbb35645f58483f45c62f10e2be1561/44737967039.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/nurujatulis.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/3203233136.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/zunopisejow.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2b4b484f6---mezetugonixarexapop.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a672aeab02bf67846cd4c7b8bbb220e2/kawiwiletefo.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/2e35851ce55e4ee2c94f12fefffb45b2/57462187258.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/zekalagiran.pdfIn PDF document text
    • https://777mto.com/contents//files/91027160460.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b9c703579d8e4f59b1bf2a4a95e885bb/salorumukuxasejatomawa.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160942dfe2bfea---gakizivugewisozasuga.pdfIn PDF document text
    • https://angkalaris.com/contents//files/5098216058.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dcb2f26ff9f4a3a43692a8fb16c56e0b/kitewovamorunevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=journal+article+review+example+pdfPDF 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_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 10960 bytes
SHA-256: d608fde16d37a32af252918aedabef5d317f93cca7f2792eaa4096156596561c
font_02_sfnt_off00013b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B07 17716 bytes
SHA-256: 08884be63d1b60c7f68eb4455a97cd6ddbb2af591cc0bce74442f01fdefd8fd4