Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7099dfaf62955f…

MALICIOUS

PDF

90.9 KB Created: 2021-10-07 13:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9a93484c90f03d490234d7b5cd78e0f5 SHA-1: 92aa092bd843e76087348c30e6a93ab71592c27d SHA-256: 7f7099dfaf62955fa6ecf325d43f8fcb3e61b3aaf2bd707392118b1952707653
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms or compromised CMS uploads. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence. The primary function appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bippex.com/filespath/files/20211003000005.pdf In PDF document text
    • https://pjkconstruction.ca/images/file/4577948523.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/320714f70c6887d1fbdecaed335268b3/sunewo.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/fipow.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/jaxaxefil.pdfIn PDF document text
    • http://ttc-investco.com/img/files/ruxevemuwifurujapiku.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/23697973385.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/16212509659.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613170c140ef6---bumaziralafezunakum.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210903_037E61FFC1B6F71A.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/18734167299.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20211007000447.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210917125920.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/96473305230.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f7c0080c1---84633976079.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/9697162506.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/36796771207.pdfIn PDF document text
    • http://skomi.ru/img/files/file/wotolewek.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/67818113429.pdfIn PDF document text
    • http://hidramaco.com/files/files/pulubatonisiteb.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210909112418.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4d2c109fa---20515089686.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/57367406290.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/zodamufebo.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/20039134799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=verses+to+pray+over+friendsPDF 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_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 18992 bytes
SHA-256: d79f05a3ba4ae8712bab65b38e6c84afa816e658ffb60de15533334d7ea51333
font_01_sfnt_off00012d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14556 10596 bytes
SHA-256: fdbc04c378b0d2332e7a221120a0ffbb7857528b668430935679415ffa7c4fa4