Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3c6f1bfb0e4b23…

MALICIOUS

PDF

96.6 KB Created: 2021-06-26 10:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 42aa9a874a4d74a2f580f0756eb5c6b1 SHA-1: 459fe6e1cefc3e5a3bdc88003d4f5d47b172238c SHA-256: da3c6f1bfb0e4b23492562a62d15a5d932b065d1c93154e5ba700a056004b774
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/fhejhjjl9gtkn8fn6p7qmjncua/wupom.pdf In PDF document text
    • http://elsekmont.eu/userfiles/file/punun.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a967896d---74890005209.pdfIn PDF document text
    • https://bombapin.com/calisma2/files/uploads/tudivowavoporajin.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608971ed8b1de---lafalenoleroxixopidij.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4a6f82ceccbe0c1c8416bb71ea66b360/41521197828.pdfIn PDF document text
    • http://airsoft1.ro/files/file/86343433137.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9fe65453---pemiveni.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/otd6r93ck836h705sbi542336f/xixewexexotipaxuti.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210611_6F1CE0692A20BCB2.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4085360294---vuvekemogazonogodovakefol.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/91378387309.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ahqmj62pi3alv0t75a1s9f67ug/36717312915.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/nekodakuta.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/tamedagel.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3ca72f5145b59f7daa3f51e99bb4e97a/rulepipufaxifizume.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/e18c79341640eb09cfab6f1595b4e7ab/59291439392.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/pogumopakizunelif.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/jfc02j8s4b8kveeups0lgn7ks2/69543395450.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/euujpnfsve6lalv9j0h19kqlv7/visek.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/litelemipetipigojeg.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/pupim.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7d238377---7846760644.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/fbdc0ac919b4de7b4ee48db87fe1e3d2/93570085996.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/rvtnjj51a87jkmadgbsfvop59k/76586789767.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/10449800088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=street+fighter+the+animePDF 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_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 24456 bytes
SHA-256: 91f365828039878842d7b26709ccde5cf7cfd458a1382ed9d9f447e0be334e12
font_01_sfnt_off0001336c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B83 10400 bytes
SHA-256: 11bf8e837684081240610dba8bb0a877262e7af42dbff9201b5adb3206b23ba4
font_03_sfnt_off000162d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D7 4840 bytes
SHA-256: 2c615f388462d0881d5622454d3d9c7a6bf486635b51d1d33e89be1d03f5fe32