Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5220a5a1c30d268…

MALICIOUS

PDF

73.3 KB Created: 2021-09-23 23:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77040271866d77ac74a1ffdd9c8d8e0f SHA-1: eb304ac16bf30af3f751933aecf97d2accf207a5 SHA-256: d5220a5a1c30d268512dae1e71f4d07667dde64b846d709ff09346395df877fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. 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 0.9981

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 https://chcial.ru/uplcv?utm_term=iphone+system+in+android PDF link annotation
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9deacfeddbe4f5dba3069040db76cbf5/75779058584.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/fowifosoragisoneg.pdfIn PDF document text
    • http://portableandcool.com/files/files/bufosinegomip.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/diwuxulibiwefitabumuz.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/miwafufenekidizipoda.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f15473c59a1b3516db4a6534f49a1323/17217626604.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0948307f4---62491009815.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0c7aac1e---64115727884.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/84c08f17ca735681a8175c69ca0b4744/24185305144.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109100624068343.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-16/20210916194808565442.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22538822273.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/79811099876.pdfIn PDF document text
    • http://sungder.com/upload/74426979203.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/43573775555.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/tidumumejizok.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/1466586504.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/julasagatonipadax.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/kibixavakoxij.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161406a996a26d---28204020471.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/33373803828.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/87311443409.pdfIn PDF document text
    • 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_off0000baed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 10676 bytes
SHA-256: e185891363a48aea313f31cd2f7835e19d6b2cb990582e610e2ceef5182ce59f
font_02_sfnt_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 17104 bytes
SHA-256: fcc8eac5f4da5153c3dd193981be1d53829be271574d91906ab9581104d91152

Open this report in the interactive analyzer, or submit your own file for analysis.