Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e42ed090f74ff9b…

MALICIOUS

PDF

81.6 KB Created: 2021-06-29 17:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6ac1afa9e743a0db086e83069cbe8a6 SHA-1: 721682c149b7f2ce686208f8510197c4ea0c63e4 SHA-256: 6e42ed090f74ff9b0506cc3d06c31844334fa43abf50cc05ed1f098ad69b53de
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple external links and the overall structure point towards a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=8th+solution+science
    • http://younewstoday.com/task/userimages/file/5944546874.pdf
    • http://jtylek.pl/Upload/file/45191735866.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae29e0e55b---gejawaninidakufog.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a61c4f01d8---kolun.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/todoxupikabofozanadutufex.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a14ca91de9f---26369176819.pdf
    • https://baohohoanglong.com/userfiles/file/vevilisizokesuvib.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b85c38c4ca1e713855afa9979e59b629/38495290921.pdf
    • https://thietbivesinhanhhuy.com/asset/files/51521201783.pdf
    • http://khanaphatgroup.com/UserFiles/file/rirani.pdf
    • http://architettoletiziamasciotta.eu/userfiles/files/53660111129.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/93918465702.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a633b60cebe---toxudo.pdf
    • https://rubenferro.com/userfiles/file/xemowemunemiridokaka.pdf
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/xijetesowexajijowuro.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/dgsg4r0dqgnlkhjdsoiba71jka/xanuxitukexaveladesux.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/vvjvhiogp7o0b1f95qvsudssj3/39756698681.pdf
    • http://longthinhphat.net/uploads/files/96273076186.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c5504b46dd7cede97e57ddeb71c530bc/46180070842.pdf
    • http://iccarrentals.com/files/file/judililawoniwizew.pdf
    • https://opsclown.it/ckfinder/userfiles/files/kadaguputif.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b898f1d10c3401ba7c84ca676d83b401/tipubipuvapesadawinu.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/12bd3f03bc001cce046fd32b219dc0e8/73888389298.pdf
    • https://meganimal.pt/site/upload/file/xuzefakawemekivafofujimub.pdf
    • 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_off0000dfd3.bin
3b47ac888a50f03815b4c419b10005a846523f804db58364d9380ecb43a11aa3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 16464 bytes
font_01_sfnt_off00010a28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 16792 bytes
font_02_sfnt_off0001223f.bin
f64556736d7acc2683bdfb630e44bde60e464469bb602e6c1f868d08a0bace4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1223F 10276 bytes