Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e19e49ba3b531a1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 10:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9aff66ad2fb849393fda87add97090cf SHA-1: a0f37bd15bb71dd87f9528171b7aa7feada41885 SHA-256: 5e19e49ba3b531a1e21b87710658c96dee070ea44f7c269ec78af6cfaf256891
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/445d77304a28e1abbb8048ab33ea630c/72541261737.pdf In PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/13709282072.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/dutobevexuzu.pdfIn PDF document text
    • http://onelove.cz/file/fuzivo.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/71636284413.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/55741846016.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/lovedowodolimatirupojora.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161385fa5b3b72---83551298883.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/bakamurivepuletoni.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/95273188115.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/93420086806.pdfIn PDF document text
    • http://reichspfarrer.sk/file/71767508421.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/pubepeme.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/ligobis.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/ketulu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446dc4b1974---wakefifefubowevaximono.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/14638224129.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/fewatasemuwana.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/477b32f496dbad7222a1756bfe4cb55a/14427164218.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/12933017045.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/50215160795.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/devekiregujixoreborinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=basic+clinical+pharmacology+katzung+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_off0000d52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52F 11356 bytes
SHA-256: efeedc22af369b859d4ca13cda84cf5f7cdd619a48bd0e33684185156a55510b
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 18144 bytes
SHA-256: 30ae3783bd3c1809499d1b839e5b5a6dcb9880540af2cf94c63e87fbdffc0203
font_02_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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