Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba46545977707802…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 18:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb6c2b756f533d9edd1cde08257bd2fd SHA-1: ca24082b5d72552500861ca8eb0610d7583383c3 SHA-256: ba46545977707802c8f60346e96edf8ff4a49668701f55f98411cb7225f461e4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and a link farm structure points towards an initial access vector via spearphishing attachment, likely leading to client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://grupophi.es/uploads/files/82867171147.pdf In PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/timilolejid.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/pusimena.pdfIn PDF document text
    • http://dges.in/userfiles/file/25924276430.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/73204942771.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/mujonukapakatuxufigamem.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614207efe4a27---fikesagosexewu.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/kexirapunakuroda.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/poxexawubiwewidubaj.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161408b8899a1d---63847234153.pdfIn PDF document text
    • http://geoman.cz/data/file/sisajudopik.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/53445636756.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210911202413.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/16653925292.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/26122352460.pdfIn PDF document text
    • http://lachina.cn/upload/file/13249562631.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/32003380111.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/66309041267.pdfIn PDF document text
    • https://webaprint.be/img/file/bebuzowi.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/51280693159.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/83234920227.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/30836573515.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6e64282e6750577379c420657052e046/sifobafikaxagogu.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/keripitizinunefiba.pdfIn PDF document text
    • http://allier-genealogie.org/File:/vawefid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=creepy+nights+at+freddy%27s+download+windows+10PDF 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_off0000b2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E3 11216 bytes
SHA-256: e3697f5644eff475f921c962e8054521741e32a27b06c6038b10bac1bf0f1f7a
font_01_sfnt_off0000cd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD04 15144 bytes
SHA-256: ec2c4ce0ef07540a663ad06044fbdc209b8a05017402bf78e2610dbdf207aaf1
font_02_sfnt_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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