Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bb378f962b1453…

MALICIOUS

PDF

77.3 KB Created: 2021-09-02 22:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87f6ab65d833aff2296f493686c9af06 SHA-1: d6b4f6be73bc7f71633f6db346fa5aafed21316c SHA-256: a5bb378f962b14536fd601fbc89e10cb5d2c3678edec41cb77bd1014ec83d5d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external links, many pointing to compromised WordPress sites and disposable hosting, strongly suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

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 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 http://szymonadamczyk.pl/uploads/fck/file/25719808265.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeddbc2b31---688441424.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/60706157649fe939e28fc56f1f33c9cc/zafidilu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eddd929b8d1---taxukekukojegu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4ff724caca9f670c26b0440cef2ffbd8/danovosisufaposexan.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/13142510831.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/xozigisitagalubotevu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/70485044158.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21587442a---56042640727.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/34553678103.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/divasawokipubasimu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/mpg5kunsfpstflq6soevv9q8h8/41608598137.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/378cbba90079eb1db706c4dfb7831824/dozanip.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8b2708eb---xilufovifesezemasafolaju.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e51417bd220b838eb9e605b9eb657d57/xepox.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/5662442203.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/15656121246.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/7701155894.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/kovijuwujupobebisesewik.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/suvenojoluluwuvinet.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/61369917711.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/l52eqf23atvsul34ov6dsk00rv/80537509209.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76bf5a181---voralamuvewewoxudef.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/21606939413.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d368814498---87434736934.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/10172460025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=assignment+on+input+and+output+devices+of+computer+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_off0000c8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C9 17180 bytes
SHA-256: 47d07a3608c97632a426160781fa5a2c570a2d875fa5415cc9daea3d49253cf3
font_01_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 11064 bytes
SHA-256: 66b31c8c11b6ce7d881228ad17f3e958bdd77bb9fca36acfd57ff3e4bc180fda

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