Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fab20f5035f1b44…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 16:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e8d6997d7f5cd1f44e5537fb116870ab SHA-1: 516958bc412698cfaa4e9e7803ba44af4775a60b SHA-256: 7fab20f5035f1b44a8cf81ca7d05dec4e9ed8470dde5a628fe205da6e201802a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://cyuanmei.com/userfiles/file/wibufesinebugo.pdf In PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d0c6376bc9dc20ce817212317465fbd3/ropadijuporumiked.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160712401424c2---wafumib.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a7e26e3aa9237c17125eebae6f5d6b51/wonelumebutuvarekutatov.pdfIn PDF document text
    • http://abpaluso.com/upload/file/97754958346.pdfIn PDF document text
    • http://vertinu.lt/ckfinder/userfiles/files/53132397884.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/98132860740.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/021a2b488c8215b8d5e2df622cf463b6/53064606363.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d5a932ed---65082385790.pdfIn PDF document text
    • http://allasclub.com/campannas/file/mibovapipodug.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuvaf.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/67281656819.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093dc33a0db5---samolizemenebezaziwezafaw.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/76862019192.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/5075269780.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/58125721317.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d01bd03fe5d---55703556847.pdfIn PDF document text
    • https://music-group-store.com/upload/files/56919733184.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/2b7ab61dcf3fd976e6fc85a69230f773/numeritigudusijakiw.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/edelovilokuboxaverusaso.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cfa8629f086a7e5a7409bbc14722df11/sobaledetarolifojodun.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/pukuzeliv.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/fonefopuzejagonuzajivo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4045b2a9b40ba9bc02b98f75e67ef71a/bajugesofezubun.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611f584aab0ad---sixet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=police+stress+questionnaire+pdfPDF 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_off0000d432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 10860 bytes
SHA-256: 33297b9bcb0288da3e20f6703dea971eb40eb7e78ed50b8673576cf768144182
font_01_sfnt_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 17328 bytes
SHA-256: e067d4e9966a65e2b4f325cfeb2058c17f57ad2da8b2e98440767a645012d1f9

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