Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f1cf21df042304…

MALICIOUS

PDF

86.2 KB Created: 2021-08-19 15:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 288bb8154bb791e185cd8c67506e1535 SHA-1: eff270838953c08ea40cc2ac81eb0fb65a823640 SHA-256: f9f1cf21df042304e77f9fe7ec964b50c3c76441bed322099f9a761420d6327f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to manipulate search engine rankings or distribute further payloads. The embedded URLs are designed to redirect users to various PDF files hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cesnek-vysocina.cz/UserFiles/File/ziwopob.pdf In PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/57fhnvgm18d56u5rmqbpju5ijn/27475115621.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/02f6f398392b1154d9b1b5a817f6a414/xarot.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a23deb80c80b0519463b7f01c051a738/48541754514.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ee97aa1a---solado.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/18490060748.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/dutasopubovunirogifudar.pdfIn PDF document text
    • http://atomleasing.ru/media/File/xovepolasafuxalakisibuta.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/xexonitenijiwatofagapazi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f9c522220---rijerugijilad.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/bojewowaradoxog.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e97beb29c44---xobuweresokan.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/rilurategeterufike.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/naxidomulinimejilalegi.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/vogikesanigize.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/km2jdb4gv2qot2etog0sa38038/77513144528.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ae24a1d7---mapivexekananojapuxin.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/32228822970.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/vemibibiwixotolorulutun.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/3eqg2fq7jq7q1oof6v3cp3m69t/kagadepatapukokesolobab.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853d38eabea---petokawiduloluru.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b95e4734f8210a54faa020afce5f57ba/77272505592.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/73403913700.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/8jepq19q49a84lihk6dp4ef0lt/75552508518.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/kn92r7ebvd4optgvlp50m1lgsq/posukuzofagukoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=scientific+name+of+different+animals+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_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 17256 bytes
SHA-256: 3624341d43a380433f09cf822320edadbe213c4ba28ca5140cfee183fb47097d
font_01_sfnt_off000118a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A0 10856 bytes
SHA-256: 303506b931428ed805ea6233a105ead06b6ef99535894b9e95a8917b9887031b
font_02_sfnt_off000131a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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