Malicious PDF — malware analysis report

Static analysis result for SHA-256 be158effd7cbaef6…

MALICIOUS

PDF

84.3 KB Created: 2021-08-25 13:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a034f932f4f46ae5cf7b27463e1e530 SHA-1: 06c751ba2ba3e7efe3bb5db6fefdffe5c09a7a0d SHA-256: be158effd7cbaef64e1b06f268238c34ce1e70e6ab9cedc2191d58253bee0e94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised or disposable, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/32862909112.pdf In PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/tudisizal.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/fojaporixumetofuvesigi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/102080d4e0d41878ec146d995ff9bd33/xinori.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/h29of16pvlnanmr2093lushaf4/9488008636.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/72554432734.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/vejezawarefurulekapoma.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/42094506603.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/95fd1a566bd568178962fc16885f55f7/jererigebofalegojuxil.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62a9c06338b455cb1832baaabf841340/nezopilurinitexifilov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120cf9b23418---fagotam.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32032752542.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b3754115eaa3e78433c486d6a4990ee6/gupojabapezilonukir.pdfIn PDF document text
    • http://ozari-ua.com/files/file/73089551401.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0924780fe5---kajizigokufelofisula.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/59868778291.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/04efffacd66486bd794c531668ea3d3d/bezedodosuvafovorimofosap.pdfIn PDF document text
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/kudodixifizosugewasixa.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/95149228313.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/80308700894.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/zuzufekiminep.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/70839429588.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/bajobisiboravodu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c5c914a8---19654855052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=class+6+english+workbook+solutionsPDF 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_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 16620 bytes
SHA-256: 07f29d9a17615f1125dd220a6a64bd25ba76c5e66264da730aeddc79e441259b
font_02_sfnt_off000127cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CF 11004 bytes
SHA-256: 09a64a5b69572a3f38109bde42ff5c5fee5b2fbd74ef7f0a264fd6faaa70f31e

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