Malicious PDF — malware analysis report

Static analysis result for SHA-256 97edb3b142b67619…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 21:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26742648b01f9f33d6ce878c11ac0bb8 SHA-1: d103b1280bfc89a0a021f6a039845d5738d15337 SHA-256: 97edb3b142b67619d057f2816b5521be5032f4439cfd2dcd83a55ba3862eb6b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The embedded JavaScript stream and numerous external URIs suggest the document is designed to redirect users to compromised websites or potentially download further payloads. The presence of link farm patterns further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=process+node+env PDF link annotation
    • http://albarossa.jp/js/upload/files/kunavamavo.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/23033805251.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/62340187399.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210901075355.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/fazalereratesuwaralimakat.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/45152137801.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/zuzepijawelitidavub.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109191614205480.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/31152741724.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/26832137116.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/segiz.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/gozijo.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/zuzanibijupamixoge.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109052244014408.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/dirigefulubi.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/tifejegetulodo.pdfIn PDF document text
    • http://allycatering.com/userfiles/vitopinarasikodajig.pdfIn PDF document text
    • http://leton.pl/userfiles/file/33507251140.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/zubajexuradobila.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/tizafaxigikigejojasita.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/bd8a58ee0ac9e4bd30b43f643b83b85f/sazapebegurobasaxasorev.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/10jes3d4tbg9vle835hamgitpr/394951592.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/860b70f068650052a651c1d9b3e81210/3563730923.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/78692311255.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_off0000ae30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE30 10032 bytes
SHA-256: ab9502df2589f7db4a46df975a1ab464ea4c9e6a3f0b68b7fa4a322091787499
font_01_sfnt_off0000c496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC496 14960 bytes
SHA-256: 5c4fb99c55361debbbde1577da0a9a929dc09e69e77a211c9018655c3c01da54
font_02_sfnt_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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