Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4587785aac41990…

MALICIOUS

PDF

82.7 KB Created: 2021-07-01 21:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9c5eb80c3540e18a66b82cef1762948 SHA-1: 7cff9082fc6d1f23d29624b45b9e93248478a9d3 SHA-256: e4587785aac419900aa78a4a9ae7f0b456cde146c5064dd69bddf3729cdc83e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c880df49b73---bopeviduwowitegu.pdf
    • http://phonphangschool.com/upload/files/pevufemusijadafibubu.pdf
    • http://www.colormotion.cz/UserFiles/file/pakodure.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f5c6272926e8718075dc0f160f0da10/dapebomuvorodubuzalitiz.pdf
    • http://vogiantinhmach.com/media/ftp/file/71745133746.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/vafonuvewugaluzo.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e12a95ea81---gagonomerutiwaxekak.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/qpasnql7743fr4ntaut9ufnt1o/zurimag.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc956aaa774---jotoxometogipotor.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/95127803437.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fbc79fb17525e191517574a8497c0ac2/gipufopipatitato.pdf
    • http://amphorabeautyclub.com/campannas/file/40113926780.pdf
    • https://nasroglobal.com/userfiles/file/54653482770.pdf
    • http://www.zywawiara.pl/pliki/40995447115.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daa7ed1f84---danamepopogowemixufel.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/qgc9np5ok2ddm2ni98k5qp28q9/36047106776.pdf
    • http://amon-syotengai.com/userfiles/file/1292122389.pdf
    • https://hosvagyok.hu/userfiles/file/47282989454.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6c454f7d---kaxewaxovude.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=planets+rotating+around+the+sun
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 16792 bytes
font_01_sfnt_off0000f8f4.bin
32ee81f406799da4a324f3b314d1b33cd2cf41e6e2b29d5713fb3f5204da8a8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 17364 bytes
font_02_sfnt_off00012605.bin
d5a636788e7c30f774e58b51ff551ed462531e10c1a534799c0d3789f6cabd19
pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 10628 bytes