Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1530aed990cebdc…

MALICIOUS

PDF

85.1 KB Created: 2021-09-24 12:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 71c4162adf07d9ff55b4820fc87b1b32 SHA-1: 04b86208e63c1594d0d48b7ecb7405a39ed1286b SHA-256: d1530aed990cebdcb37df626c1b98508225f9b889c69743a970fd431a9b07f27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic findings and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pistant.ru/uplcv?utm_term=solution+fundamentals+of+physics+10th+edition PDF link annotation
    • http://stauarchitetti.eu/userfiles/files/vodijusovijex.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210918_A11DD915F6EDF7CE.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/97854496077.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/23588182009.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/83207599096.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/rusemagigasuvametivez.pdfIn PDF document text
    • http://falconltd.pl/cache/file/9641030667.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/kelasorodubasizowilekim.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/piralivubugewomu.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/68896824497.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/2eb95dfedc4db331658684ca2f2f9753/pelirufemizunewujajutolo.pdfIn PDF document text
    • http://akademibt.com/resimler/files/fimosumawopul.pdfIn PDF document text
    • http://pb-book.com/user_file/file/92761871865.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/fijufim.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/38967573706.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317a16b2c7e---wevuwosemo.pdfIn PDF document text
    • http://warehousetraining.ie/images/37374676359.pdfIn PDF document text
    • https://stotex.rs/files/67674593277.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/60a025b4baef3e38f14031862aa9a592/bilofobaxorubivobufidesil.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/84836775876.pdfIn PDF document text
    • https://activepymes.com/pub/file/jijijamibebojogulo.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/gibawafig.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/rixobututimijanezifuwaxa.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/97950816494.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/91184269110.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/vebomefetamigutizizepoxox.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/fibewetanazesigoj.pdfIn PDF document text
    • 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_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 20048 bytes
SHA-256: d3f7cd56bddccee443a3250b9df636064d6c7e9329b76846e9c5a798d64ef10b
font_01_sfnt_off0001141b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141B 11248 bytes
SHA-256: 477bea4024cdb1316cf8c5c00a0b7b6a77effc1e4487a4b91a5823db3cd0ce61
font_02_sfnt_off00012e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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