Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f20aa30bc4d1f1e…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 05:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4ed962556e6d6daf25dde5d7bfddb3e SHA-1: 56e29e29b92b74742230c79b12395c562f8a1058 SHA-256: 7f20aa30bc4d1f1efbe82d3b2a6b6b8dd6741e2eea07ea9b78fe93da89a74eba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://millecolori.it/images/file/35536489391.pdf In PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d811be86---lanelakedoratasesu.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/numenef.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/penagiwusipilimumugefavuw.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ef1bc576c590ef4befea0eed55e0f26d/58219000555.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd8806513---69029900833.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/16562740796.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/faxefipazu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161364bae8a2c5---xopokokadidumamipuzereve.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/66006991713.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109031222593503.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/kisirevotesemu.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/11084793301.pdfIn PDF document text
    • https://adikketiga.com/contents/files/sesobigoketor.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/jenuwa.pdfIn PDF document text
    • http://farashimirooz.com/files/luxezebujeb.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/38125048153.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/tenaxevezegadujis.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/zajiror.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/guwupubidema.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/fosemevidami.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/98708724808.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wafagi.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/7733450614.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/32862150822.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/67527691890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=w26+plus+watch+facesPDF 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_off0000b863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB863 18324 bytes
SHA-256: 9edf8ebd1f6666660237b2a3fd0bd4800b7f5b06ca8b951b344ab450ee4f8033
font_01_sfnt_off0000e84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 10628 bytes
SHA-256: a9f72612ac7b629c787847036621c7e9b313142c085013add9138cae929b874a

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