Malicious PDF — malware analysis report

Static analysis result for SHA-256 482bd98a9fa54ecb…

MALICIOUS

PDF

121.2 KB Created: 2021-08-03 00:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2794c73cc24735cad0d581c22fa36b4 SHA-1: 05406b1c6bb3d4df553316b7b20c683299b1fdc6 SHA-256: 482bd98a9fa54ecbdff00c2e7476865b1a798b4a4a03e5f9964e2d5fce91bc18
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and a PDF containing a deceptive download button. The embedded URLs point to various PDF files, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c840da3a14---walezuzebajamezib.pdf In PDF document text
    • http://magendans.com/imagefiles/file/31816461781.pdfIn PDF document text
    • https://vientangluc.com/upload/files/mutakewurirosuxozopuk.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/20417219644.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/47997697984.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ba0512cc1---14516520027.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/38288686359.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/xarimifepunosubo.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/53905198762.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/046865f411427959fecc20ddcc4f2b4f/71061038439.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/gibasokajekojideg.pdfIn PDF document text
    • http://ned.ru/uploads/files/21694223128.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2a6f68b1d---tabudinavuxitibeduji.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/rakenobot.pdfIn PDF document text
    • http://stepsforstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/jafefeduwudemabuxusam.pdfIn PDF document text
    • https://mattress-leader.com/media/gevagugewanefajaxojuzizef.pdfIn PDF document text
    • http://built.lu/userfiles/files/36031362506.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/5461045184.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/nijap.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/vewelofarupitajolef.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/numak.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/82632252239.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/lomebomugoxexaxufir.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1593da2e5ecad6aff22d97f3494eceee/wekavolejasosop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=unblocked+games+911+friday+night+funkin+tricky+modPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000152ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152AD 11596 bytes
SHA-256: 8229f947ad9150ca0a04b8b192ef49d73745e4a1127c75672f05f68253b6239a
font_01_sfnt_off00016de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE5 18136 bytes
SHA-256: b255ab36d214a126ed6c93df559c7fca0693d07996f5c2f5af3133c8c971ff93
font_02_sfnt_off00019de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DE4 19556 bytes
SHA-256: f5391529c1bde65030fce615ff9eba3445d21471faf88a88736ac9090c6b737b
font_03_sfnt_off0001bd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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