Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4c0716fb5cd262…

MALICIOUS

PDF

87.5 KB Created: 2021-09-06 20:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2577c13eb6959cb3bedb79190e7c590 SHA-1: 30efb32d6ddda82a1cc9af714a15aa3a04d93d90 SHA-256: db4c0716fb5cd26273ec4d2ee0d17eedb45594c45ec8764a7f7ac38e309ed7be
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. This suggests a multi-stage attack where the initial PDF serves to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://renovfab-menuiserie.com/userfiles/file/5492078718.pdf In PDF document text
    • https://capecoralliving.com/media/file/fakinukevizuzofik.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765b7d40945---rogatasumileguzex.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/zevujuwepubi.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/45379786727.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0fc6172f1---morepesipirutekib.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fc2546487---subak.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/44944493727.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/pawijasemazegivut.pdfIn PDF document text
    • http://ezibra.pl/upload//file/zekosawagapu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/1300c0e89fbdbe19e4ffa3bc3b6b9fa4/majuz.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/segebu.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/f7e1s93qbojabto3m7m7kdj800/41824883323.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/xagizufib.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4351eb08a---nabukewo.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/katukufazinexavo.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/ratemavinapavi.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/bufigulafetipex.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/15a9478b677adb65e553d9b73e1ee344/xaruzebowawopumidukisewu.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/61428918101.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/mazuforedifoj.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/22148022796.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jifukapisibodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ottawa+charter+of+health+promotion+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46B 23908 bytes
SHA-256: 9987db912177bed530cda8ac690431c5deceeccfde10820788d034b606612aac
font_01_sfnt_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off000120c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C9 10828 bytes
SHA-256: de36861d6f8aa86e8c74c9ad80c066b1edd083413e16a304a2ed611772278f18
font_04_sfnt_off000139a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A2 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4

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