Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ebfc503357d1c9…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 02:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1a2debadfcdcab57e1ccc96790eb555 SHA-1: 24995ff748bc75670c3ee7ccb964be0830f03325 SHA-256: 58ebfc503357d1c9973727817088c9d374779c9305a81a915151b9626c02359b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm. The presence of embedded JavaScript and a high ML classifier score further suggest malicious intent, likely to lure users to external sites for phishing or malware delivery. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=hill+climb+racing+2+hack+latest+version PDF link annotation
    • http://speed-r.com/js/upload/files/wizinijodapafozalik.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/zejuzifesanibugane.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/febutasawubima.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/51159772921.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/megijimefap.pdfIn PDF document text
    • https://datajournonepal.org/files/domeruvuzepu.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/zaludaf.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/bokavenub.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/60230178806.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161322e808c987---jadiwizadusapufurenane.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/18542954958.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/49887799853.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139610138855---18085767818.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5affe2ad3---28790891777.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091805594179.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa1866b4f1---7127140864.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/pugejumisu.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/42955676118.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/munifoxexavedexikixog.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/78903634741.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631293484.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/14729477358.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/kolemirifarijovutose.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/95403396010.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/wixowinejiwujebukiko.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/pakolurinupebekaziwidesu.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/weseveligebajetivumam.pdfIn PDF document text
    • 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_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 11088 bytes
SHA-256: 185b647fe226a43772bb92b254046a10aabb47e93e62ca952fddd30986c3806b
font_02_sfnt_off0001066f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 17324 bytes
SHA-256: 9559db07e717ebdf9dd2847c97e7620b98ae2c4a37fbe5fcaa9f43f506b778fd

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