Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2350e79d56b2111…

MALICIOUS

PDF

75.8 KB Created: 2021-09-16 21:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c318ad4407dcd934b2b5dbfaccd300bd SHA-1: 0b7d0e4289ce752f1b550a6299825b6de0968774 SHA-256: e2350e79d56b2111b9f2f067932de4f8137aef702208e01928f313b8e614f6a9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure strongly suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=ppsspp+for+ps4 PDF link annotation
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/furevowekajozefupavudawa.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/dibusur.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/72663069635.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210906105458.pdfIn PDF document text
    • https://pindimana.in/uploads/file/14186710406.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/diwikekut.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/fodazemawafigoko.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/41071904191.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/18988392454.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/tosujefile.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a6d4e353855480b2d68210bcd8771efb/pozodejesogoz.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/tekibalemazalakuzatu.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/gapoxefefiragoxopujog.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/40325077110.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/22381651364.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/vizikozavoxupefa.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/buwuxuxaxudugesoxeveg.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d7ee4565---72330487605.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/72183366451.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/44186689690.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/94226573179.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b761f889---83916242149.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910210003536.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/lulepifalixoj.pdfIn PDF document text
    • https://shibbirs.com/media/files/2969579671.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/44767021691.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_off0000c89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89E 9796 bytes
SHA-256: 2440a5b522d22a5cf0890c3e7f307809bcfe5edb800bb9f38fb852e781eaad91
font_01_sfnt_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 16748 bytes
SHA-256: 033181dc2475d427d34fdfc9d559935ee7333c0e218408d4a463a115ccc497be
font_02_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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