Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43542806c49a23e…

MALICIOUS

PDF

76.6 KB Created: 2021-10-02 14:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ca1cc190ec33b5958e2550719b93156f SHA-1: 4f519cf183a2f8a8c8e377059606403836a23475 SHA-256: c43542806c49a23e67d7741b5c1c5daeea14bdad2fadbca2cc48e04fce82e88f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No specific script functionality was discernible due to obfuscation or truncation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c3203763---xofopalux.pdf In PDF document text
    • http://gardatrans.com/content/Files/53621641294.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/vidajogorikagowir.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/93388183783.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/dijematowasevusezajur.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/6138009070.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615709e109762---damal.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/56697842403.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/27303951648.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/rexosizokanafomamisakana.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/fisabebexuxezadukani.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/40871208856.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615808f47a06d---pebajekuzesufewe.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/67056564562.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/61294032111.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/zezozolizeroxinosipajeb.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/wetijuwafugimapinuzedotan.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161504a20d1ef4---95365217765.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/punoxuwap.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/19149884893.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/jumenixigos.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/48331289008.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210919081730.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/76399712774.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/nefifumejinutorawe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161563a08ed676---60140889887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=partial+differential+equation+of+second+orderPDF 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_off0000bf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 10716 bytes
SHA-256: 7f9ad489668b992f9dc33adf8845969a457bf1c25e8fe7ef6eb66ca501fea6cd
font_02_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 19812 bytes
SHA-256: 327708a8d13b70793b464237365371e193c8a2c0308a66c10454675bda7af8c1

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