Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8074a77a0e99a35…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 15:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4ecb081ea790eb93e2bb807a22828eb SHA-1: 7602b6a23017bcc76677cf48be4ec5c14f9c776b SHA-256: e8074a77a0e99a35f924a23c5c74f6b33d2ffc8972690137a0cfd011e7f87b57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.pattyn360.com/upload/forum/files/lifobodirapujiwuj.pdf In PDF document text
    • http://thecuriosityshot.com/demawijizafoniv.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614349a89682d---vusokuwetuvozomobozigov.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/digegamiwakorukuxilemupi.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c7460ac298bb370792c9f7ab861bc1c5/6964253702.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/rebebepokonafiro.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/36e5689d554c112aa002bfaa213783ec/53329146679.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/nanenanalunabofilateporer.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/faxodixupu.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/tejekifazetixin.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/zunojovisokemazad.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/1590196240.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/13029175155.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/10/rotuseleduwa.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/45504589733.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210913_162707.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202108312347073770.pdfIn PDF document text
    • http://demkapi.com/resimler/files/91228022239.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16140497888138---33049612600.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/lexevumixodofu.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/9618682642.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/51169194865.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/39156811109.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/17189124713.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/12103220163.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/36275896189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+fast+fashionPDF 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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 10024 bytes
SHA-256: 9e532c992019f0c192055a8ecdff4c9767ba08cdef5fe8bd4d7cb607d5d29f5d
font_01_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 18188 bytes
SHA-256: a2a2e3e90e8b251bf4811df4d7b4da69472984d76bf623f340aec9082e158929
font_02_sfnt_off0001255a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1