Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafae6af96a74b6e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 09:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f859eac782febe41decee4dc0f6544b4 SHA-1: 4d7e6e97992e7a50770764e4be941711436d05f8 SHA-256: aafae6af96a74b6e48b8cee7ffb50685eb04a3f7704598b10ce7e774674e5e7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is designed to host a collection of links for SEO manipulation or to redirect users to malicious content. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=android+applications+crashing PDF link annotation
    • http://ff-engineering.com/userfiles/files/60037470962.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/wuwemelixipotovo.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/pifeliwesemaxabudakenob.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/sipururosodukiwaji.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613572666df1a---bukifomisatoxijaxa.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/55217588101.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/rakixugew.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/wefetujodetumeli.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/72b45cd6dde213a7955339bea6c06bbb/77442904518.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210902070424688.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/loguj.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da43dd81b2---xurajekoponilakamotezitek.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6ab2a1d5---tituluzawezesavotapu.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/telofiru.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613011ef53b9d---modulazovogatejenemep.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/28285060378.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/48168065094.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/74390507821.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/jafojaz.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021910_111523_151.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/44178028929.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/77795389025.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_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 10644 bytes
SHA-256: 60b6f46c8f522104497bc7348572e70a3c1c04033a55cc9cd85642c44faac3a4
font_01_sfnt_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 17732 bytes
SHA-256: 71330fd0d826b7024d5dc8b88016f81cc2c922e063dcb2006b9720972e1470a2
font_02_sfnt_off00011ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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