Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1cd8587c0950fe…

MALICIOUS

PDF

78.8 KB Created: 2021-09-22 13:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ecbe5673a1e98a59a31512a7790b7a72 SHA-1: f1baacda4db7f80324b6894db58869920d060788 SHA-256: 2e1cd8587c0950fe7abab4e6d55aace941274089248daa19f1b3ea981927c508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded content indicate it's intended to facilitate initial access, likely through social engineering, by directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=ishare+tere+karti+nigah PDF link annotation
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/fukajaxiwogekepemubefalix.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/60800160473.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/86248651711.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a3b2ebeec6765491318cdf96736d4f0e/seperipesobajeferanow.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/suzukegi.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/wixiwanuva.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/62c3ba051da1f9275f0c615aac48a6a2/xilubisoz.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/kofatopul.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c0f00038471b11b40ce467a00fa1a1e2/16746546180.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/46209923295.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/36269657193.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d479836263---bozobulawomikazul.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/kosejulebekojatox.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/pasusawerik.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/nilata.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/feluguxawufawazajum.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/wurekigagesavonidu.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/16033087597.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7b7f5d589921783ee744c41d5ee1aa9f/lejabupusuzuxa.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210911062147.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/8799818523.pdfIn PDF document text
    • https://netlandschool.cl/files/3596735457.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_off0000cdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 10264 bytes
SHA-256: 44ccfd0461a25ff22c6a1be4f629357b3083e0d256552dda3f05c36270138c6a
font_02_sfnt_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 18704 bytes
SHA-256: f0daec0f964632c84642b3b2f5c6e917f1ad9ff7735168b2527de81c9d28fa80

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