Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c22b45c2d18bb25…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 12:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b161d3e9ec41f2cbc6f908b9f5dce9e SHA-1: e9fa7bb2c5147e3f624a3a74b0a1aafb524f9893 SHA-256: 3c22b45c2d18bb25f6f4cc289b246e9d2cdb2c9789965074aa10f31337412ac2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The 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 on disposable hosting, with numerous links pointing to compromised CMS upload storage. The embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

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 http://bamila.vn/luutru/files/datetipefawibikotir.pdf In PDF document text
    • http://ksnjl.com/userfiles/files/wivopexedefomiwatufelu.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/letab.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/laposobutipiwojaza.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vu018h6ktbuvctechrb5imni95/mijuloxepamokagetimafisin.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/bemogezalezoxasufisapivi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0aef7c30e---1689643962.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/89420813128.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/vifoviligatoxutuxiju.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/xepadupiwepevem.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/15068820115.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/xugowifi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142392c41971---dawulatokekelezizafamo.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/43978584063.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/63396189639.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f031088935---21466995207.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5101eab22---31162612790.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/nuriwoz.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/juzejalupuxejisubop.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/gfbis182s5lbqlc8db28l0mt53/8702117112.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/mamuwenimelixetiwin.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9da18107c136d97970d441d0b65268bd/fetedegij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lock+screen+wallpaper+blurry+androidPDF 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_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 10896 bytes
SHA-256: 31f1fcdfe7f74801713c4eb798ae62580f4056c5f5e26a5e697371c9da93a5a8
font_02_sfnt_off00010c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C39 18488 bytes
SHA-256: e6004902c9b297895e024a7c06b2477521c647d649c25dc3f08269709b40c37d

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