Malicious PDF — malware analysis report

Static analysis result for SHA-256 304e8d31337d790f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 10:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d24c75fc1d01a045b4a554578e5336df SHA-1: 31f28ab4690af1873924ae4a8919a06d6302e8ec SHA-256: 304e8d31337d790f7b61e19a7352ca396a6dc659b43736bb4f22ef3858e134f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

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 https://archism.ru/uplcv?utm_term=sap+android+apps PDF link annotation
    • http://3bbb.fr/ckeditor/upload/files/31397339738.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/degumorajavonubexosafiwan.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/kokotorirokufurikonu.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/malibukenuxizat.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/51353474609.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/86707504203.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/85960142349.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/rodegupipopamodadezuv.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/zuxupox.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/42132609784.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/fajovokugugugazap.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/zirojitipolurelufodib.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/52772330882.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161342f1d671d9---67259905604.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/97127975055.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/jibaforigasigowaseve.pdfIn PDF document text
    • http://ahchala.com/img/file/nutevokab.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/sibawamodoka.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/dukidebek.pdfIn PDF document text
    • https://rcot.org/userfiles/file/19183791823.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/20919278140.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/vumekafulovexadejemut.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/55fa913519af92436a618ef58e6f2fbc/jawafutezutuxulebi.pdfIn PDF document text
    • https://alohasafaris.com/files/24188544725.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ab1eda3c4b17306b0548f8ffbcaeaf0d/10878142933.pdfIn PDF document text
    • 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_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 18056 bytes
SHA-256: 6d7d45b4414fb111455e73b1262de34615ad937537a9ac50530ccfc0100041dd
font_02_sfnt_off0001328b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328B 10184 bytes
SHA-256: 9ace962900de7bed2e92933979e7ed48d9cd9949ec3dffc6c269388520c6e001