Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a1ab9922d04ed8…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 15:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a7bcae227dac83afebbfc879376cc1f SHA-1: b2be645d00ae4d819c8bc450c275514911e44ca0 SHA-256: 39a1ab9922d04ed8fbcc456e4ab91f65f4c1e6b4906d1c801a36820ad5465761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm for distributing malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL analysis point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://animaliadielisa.com/file/wotopibe.pdf In PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/jidegenolexutedeni.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/78718742060.pdfIn PDF document text
    • http://sun-eko.eu/files/file/bafagopalitudobezi.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/60042329481.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///xaxenibo.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/83407097611.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/92348006815.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93840612197.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/vomoma.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/08/file/20210708_105308_178.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/28083519688.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087236228234---87213929956.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jatil1qgmlu91p4hg28d6bc9q3/32242771590.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/54577666540.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b3cda18e59789a30a238f3777a68b629/87854649610.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cd6a9be43620de3e3ace8d0a62bbf001/wizikoletepakofibetuja.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf68357368b---limipavepajib.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/98891742287.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/zebopurem.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/90517190889.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161100aed6348a---sufafed.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/msqdouqgj7nvglpq1e752bpcc0/14301266698.pdfIn PDF document text
    • http://school15-tyumen.ru/f/65628141820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=nitro+pdf+download+for+macPDF 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_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 10544 bytes
SHA-256: f776705b80a24fa317d4e8b7c1c733af49910321f4c4d388f826901a1378ce11
font_02_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 19144 bytes
SHA-256: 8ed67e7a0f5ce5fe87569f10d78611110edaffd7ae78d9fda8cf57e649fff35a

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