Malicious PDF — malware analysis report

Static analysis result for SHA-256 34edb7a811983291…

MALICIOUS

PDF

76.1 KB Created: 2021-09-14 08:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3029df70133731fd6991737081c26bcf SHA-1: 2d266d20ad1e42db629a184fc82871889c3b8884 SHA-256: 34edb7a8119832917de6a006b32a9c495444cc69aa2db003d3d67c9917cfc8af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to potentially compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded JS and the nature of the URLs strongly suggest an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaed147654---58254887395.pdf
    • https://kirmatas.com/userfiles/file/68066653220.pdf
    • https://dp-silver.com/userfiles/file/79523555489.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaac85a668---kinekuwokefuxupamijopoxo.pdf
    • http://salman-group.com/userfiles/file/77758127866.pdf
    • https://photojet.bg/userfiles/file/51183943893.pdf
    • http://18554080.com/userfiles/file/serejafus.pdf
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/xofavi.pdf
    • http://jingmingtai.com/filespath/files/20210908152123.pdf
    • http://cnpair.com/userfiles/file/funuj.pdf
    • https://xehowo24h.com/images/ckeditor/files/20329621456.pdf
    • https://nikunjfoundation.org/ckfinder/userfiles/files/15155186.pdf
    • http://techbico.vn/uploads/image/files/98717950846.pdf
    • https://ashasuchikala.com/ckfinder/userfiles/files/popowekabugemosazeloxa.pdf
    • http://fishngrill.iorderfoods.com/uploads/files/8086302248.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e81655712---58671369606.pdf
    • http://nature-revive.org/files/file/17384004240.pdf
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/28178936016.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351683d48ce---sidomorubiku.pdf
    • http://yejida.com/userfiles/file/laluzabe.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f273e48e06---48706396257.pdf
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/tinofedazu.pdf
    • http://zgkimsteszew.pl/img/upload/files/vobisitanigedulenulenut.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5422d48ac---posegivaxosusasu.pdf
    • http://oskarmak.com/userfiles/file/jawokusujabem.pdf
    • http://studiobaliva.eu/userfiles/files/xotamatajosop.pdf
    • http://joltiy.ru/uploads/files/475989128.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dragon+mania+mod+apk+new+version
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c469.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC469 16792 bytes
font_01_sfnt_off0000dc80.bin
47c4f2a4d83a5d53393cb1c44147d9d7e9f41a80f6acbdd446b2d3429bb55f43
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC80 10836 bytes
font_02_sfnt_off0000f54c.bin
6bc981530f5048bf42bbbc924a41b57be07cbb4b2cb8216ca3fb74989d04d22d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 17516 bytes