Malicious PDF — malware analysis report

Static analysis result for SHA-256 1acaca169a212d3c…

MALICIOUS

PDF

81.9 KB Created: 2021-07-16 18:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa03f50dbb6356d6d9613eb35b09371d SHA-1: 239b7d62f36e136a983cf41082f32dd18c41a512 SHA-256: 1acaca169a212d3c42ff9186407213ba796009c3eb9c05bf471308518309e254
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics strongly suggest this PDF acts as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://vinadesigndanang.vn/uploads/image/files/1961108255.pdf In PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c533e093cf8---sunegexagit.pdfIn PDF document text
    • https://jagominum.com/contents//files/87040878181.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/mezadimuzabesurevazakepif.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210521101152.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a73e5e2f1c9---badimurafakuloli.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/bimatabofi.pdfIn PDF document text
    • http://zzweien.com/d/files/67918340194.pdfIn PDF document text
    • https://samudra99.com/contents//files/45403716657.pdfIn PDF document text
    • http://esistore.be/userfiles/file/pureretomamefapex.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/vn8cv462a06m6sg5lm28p953t0/denevomilodevubirefuj.pdfIn PDF document text
    • http://htwy.com/upload/file/54272329374.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8008da269---2091343828.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/xilezudixumu.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/joxiridupaselivunir.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/5229ab540cb8175a75d7837ff25ae93a/48134599902.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/65hba3n1s73kn53csptvtcpbt3/93192869240.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19fdf706ba---66114404155.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/hrse33i05q75eu4kbj38rpa0db/jixavunosesedixakuminob.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/risorifefisu.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/14/63670441454.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/85a4761661088d5a6eee45db9aee8285/rudiviwenos.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/984292fd8c11919f527c653fe1fd92cd/regixudar.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160966c676dd3a---24846511571.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/vosux.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/wevitumeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fifty+shades+of+grey+movie+download+hdPDF 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_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 16856 bytes
SHA-256: 1bbca873f82bba229a11080b1c5ad7ee4e9adf95b559d018a2157a1da6ed4b30
font_01_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 11044 bytes
SHA-256: b9f5812d5e8155e3176ad08485830b235830bb77a89eb73e541f19c99d2bc041