Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0065c89d000d77…

MALICIOUS

PDF

137.2 KB Created: 2021-07-07 23:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6dd0a1d1682cf83d43c3cf6bc1757273 SHA-1: d39e932574f3745da9fd8880b0a8d5dac883ea6b SHA-256: ad0065c89d000d77f13ac1cd8d8a4c96eec5e49e24bb679542fcabb3d727ee20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/5dp4rtb9mmadk8v2r91479q4r2/16429056773.pdf In PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76b2a9527b---82507006785.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/logosa.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/15353989281.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/dozafifu.pdfIn PDF document text
    • https://agermag.ro/mm/file/26821526545.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e95af3ee7fb53df9173562a44f3d1ef1/19394012746.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/wofapaguko.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/2d8f37911dc370bf110d7a03ca9f640d/17286284716.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091578eaf30c---setukotomuxomijedozago.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0433221fcb---24397858268.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/lirarinoza.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3a5cae1ee3dbfc4be6150c160eadf6c5/70495607057.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8e675bef---wufixenamu.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/6gvc4u42onhutpm6rpone7mtoh/24772516878.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160870ca99da06---wibasewexatexeruxinulopu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b941b8a819---mawedilupupanozewavexadix.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/61721501679.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baec55b70ef---94806710757.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1de92068a---89749707247.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/betomokijovozurofu.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/jivigapemedizikewul.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/685e6f6a7051a296c901392f42e38ef9/pipugebabinazulezoke.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/18560976557.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608d505560836---dijuxepulidebepubekuviki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=effects+of+chemical+industries+on+environment+pdfPDF 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_off0001b4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ccde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCDE 19464 bytes
SHA-256: 05cd0411eb0ccc5a412f2a2fac0a7ef30bf01461429cfd928d5c3ef14f284cc2
font_02_sfnt_off0001fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD3E 11036 bytes
SHA-256: dee2be47fb31356a79b3743c3d21617da14a1003efa6f2fd4064ee89bb61be4a