Malicious PDF — malware analysis report

Static analysis result for SHA-256 be63ee70a2a4bd9c…

MALICIOUS

PDF

88.1 KB Created: 2021-07-08 12:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ef8dfa6ad04a6e802d0986beed784d6d SHA-1: 27ecc48c964c0ff0d654e0a3f761e3be4613448e SHA-256: be63ee70a2a4bd9cf1ef5a67fb170470ad9b47a614795c1b5a4873c2d4c3baca
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics strongly suggests this is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=for+investors+in+the+stock+market+dividends+from+stocks+are+fixed+and+guaranteed PDF link annotation
    • http://sweetbasketsbyjackie.com/clients/864293/File/lupimojusagagirowixeza.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/93dbf53a7b6280a3a8d3c926d9720826/wegoj.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a490e444c4db29225f15447b8de2a3f7/84675813544.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/misinomojukokugag.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ab2c13c7f---89692321406.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/47386583271.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/80632334782.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/57815131201.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/nefiriwowafoloj.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9669b38742---birimemalapam.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5bf423e8e71b4389ab1c25a47fac6e74/17924484695.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/68m6c7iplrhg28thbu56oq5iio/werofawazikazeganojoku.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/bokulojuz.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fca9e12730---41879464772.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087a25809224---davamamupiduli.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/58530869606.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb040784d071b2f1bbb9f1c602b97a81/bomoder.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/wuzupituz.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/u9asn59joju1mug5ai8rln6vms/nemolisib.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/wirusiru.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0q2jicm2d6b21120b24ub4ud0g/24575355559.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/kewukutusetavewopegune.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a880e9150---40626635231.pdfIn PDF document text
    • http://www.toptehnik.si/images/pipuxusi.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_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 17424 bytes
SHA-256: f9479085568fab834bc19daef1aefe4dedcdc5ff2dd1e07eecadf83788fc2cfc
font_01_sfnt_off0001204e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 11212 bytes
SHA-256: da9ce2b59c55924bab9fd0b5d3e6b671eec6875affd4ddef0aa837285fc582ab
font_02_sfnt_off00013a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1