Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e2d7cdddc6de33…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 18:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9cd30dd514c1a219ba82cd20aa9b3e7 SHA-1: cea186142da49190b2e3f19161339cd81ba9b493 SHA-256: b1e2d7cdddc6de33238d336f5c1aa53c0ae2a62b00ac22bbb5142a649785e606
192 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including a raw IP address and links to compromised WordPress uploads, indicating a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing trojan, likely delivered via spearphishing attachment, aiming to exploit users into downloading further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=jenny+mod+apk PDF link annotation
    • https://www.prshots.com/ckfinder/userfiles/files/vudil.pdfIn PDF document text
    • http://balone.net/_upload/file///gorutenabobegiri.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/vapumabubuzexevo.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/bogejeli.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/ralup.pdfIn PDF document text
    • http://hijoin.hu/editor_up/bugekagizopelarewexijonev.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/fotopunekudep.pdfIn PDF document text
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/58840205281.pdfPDF link annotation
    • http://brukbet.com/user_images/file/tozuravosotijekibuf.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/22842741316.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/35429347656.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/96529352952.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/83038719547.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/nujuwus.pdfIn PDF document text
    • http://knipia.com/userfiles/file/loseno.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/48376941853.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/golivodudobavezenitesokej.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/14485473311.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/895cc50539e5d6bfee6cb43691ef62cc/dolerotat.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/64e63e12a54d10901c12fcdd990c58d1/katotaxom.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613d51a67f232---86497563020.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/dotozawufotimarunifap.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/fovomejotojedebu.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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 18064 bytes
SHA-256: 0075addca57d0e95814a0f9f8a69cb52f6d044b526b91455e81716c8436f648c
font_02_sfnt_off000122fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FD 10248 bytes
SHA-256: c58b00dc31a5896e6d4763607321be64366f290c40e877fc1b44ee99f632862b

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