Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f1354634895576…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 23:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 043719b8d3686dfe641861fb2c3d93e6 SHA-1: c07fdf39f9a7903133a98d346ea1379cb110f6e0 SHA-256: f4f13546348955768e13f273056fd68e1c7dd976db7b9c423ac88783bc053110
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features multiple link farms pointing to potentially compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d32261f8c---xoberibamebuwanusuxubine.pdf In PDF document text
    • http://youngshiny.com/userfiles/file/1623205343.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///pogab.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161149c8c016f7---bumuzogidedameniz.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/sedalenedirijosubasu.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/22004099717.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/wamebat.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d77f50242dd---fejefejekerufinom.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/23f04c0dc5b0b0aaa01083328a739d14/xisogonazegilu.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210827202227.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/zukafamorez.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/9nsukg4mciupeo4me32998ihkc/54875017230.pdfIn PDF document text
    • http://cochu.net/resimler/files/44259037002.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd9eca195---66344408187.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b64c5c5d1b---rimagenegiwafaxemi.pdfIn PDF document text
    • http://wajl.net/img/file/2021715161342.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/83497414171.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3b393a7cea0997c980cb8587d8ecd2ec/84589785624.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/bujes.pdfIn PDF document text
    • http://simonide.org/userfiles/file/nexojosulegusuzikat.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a809324437927b3184d75209ac8dddd3/wazatemufitisexido.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/xudabu.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/23745578197.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/35025891140.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/kanuxukujoliraf.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/miluwegojibosupegopunap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tetrabiblos+pdf+portuguesPDF 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_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 10772 bytes
SHA-256: 68b62413134303e4c3ca1ad29f2c54ab872720dbe3b03a57f62482a7f0822c0a
font_01_sfnt_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 21144 bytes
SHA-256: c410b2e5360ad4172775a121a69bcdc22fbf623ce132e96d3f523a5eccccf14f
font_02_sfnt_off00013500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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