Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc67a6fbdc69af41…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 22:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84ab317d1a9161d0a326306d4c2fb8e9 SHA-1: af51433bbd330809ad8311fd47bbcd34f54f8cea SHA-256: dc67a6fbdc69af41f4081c4556aebbcdfc20df6947de329c4192493bb7619f04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and an ML classifier, with ClamAV also detecting it as a phishing trojan. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://nifaelectronics.com/userfiles/file/petutajipemed.pdf In PDF document text
    • https://gotamsui.com/ck_imgs/files/rederuwuke.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/xojolepogotasesamirax.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e55867970ea---bujiroserewaguki.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/l5hbfds4qrmoegg6m8olk77uhq/84778964513.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/kiteviwunumiparepafipa.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79be51909---fedeju.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/54019894440.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/86667858734.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a326dd3c44bf3aeac55f447c9a03adb3/4124679419.pdfIn PDF document text
    • http://rentaruedas.com/files/others/gofirosewufiwe.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611d87f911252---vilovijutinudamape.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/17385540313.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/de846bee240dc2fb72fd44158e2b37a2/fizowegotitatafijopuw.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/dumoxarevagaf.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210522120311.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bab995872---79735733399.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40445088800.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/15544016685.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/1609759003.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/rubibarelepapepanofovegej.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/fifukimofokudezom.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fbdd9153be---rusov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=past+simple+continuous+perfect+worksheetPDF 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_off0000d4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B0 11024 bytes
SHA-256: abc0411998814799c85e22ea1d6787a8029cdefc70b9d34e673bb0b956e1e530
font_01_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 17540 bytes
SHA-256: b939bc71b70fb209563ca95be42172764d51bfc7be883047a951c5db18012448
font_02_sfnt_off00011ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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