Malicious PDF — malware analysis report

Static analysis result for SHA-256 bebb3a01f720e25f…

MALICIOUS

PDF

100.3 KB Created: 2021-07-15 21:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d9d7d230f390db578ad44bd61ae5d74 SHA-1: 8e2a001dbff7b757aba2c5349922b42848cbe2dc SHA-256: bebb3a01f720e25f38f04b36bd0a3f5ae35397c1efa3c304f8051a4162e45b66
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, combined with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggests a phishing lure intended to trick users into downloading a secondary payload. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://coretry.ru/uplcv?utm_term=3+day+notice+to+cure PDF link annotation
    • http://nuraski.pl/wsg/userfiles/7374422925.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/rimonelolasunuzojebovadeg.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/10346877153.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c2539a960---toditonisobobamaponoduje.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/5346bd47c312cbf16a7cd103d4e38c42/35911788893.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d5df878bc5b8b51bb60b13cc2ac6112e/92881146563.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f552f81181---dixabefabesulo.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/pga79se2t6jkahrt77aso0sfcv/77991317427.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/mexoketiridoput.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607febd3e482a---43248441107.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/23017178962.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98d6601012---meparumorufiru.pdfIn PDF document text
    • https://curvy.tw/upload/files/82226040266.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971131529f2---luxawebakegotuxilo.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5upluik9bgeuv14g9aghdunqne/xexawejamopozodokufiposu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c99300e134b---pewupurogufikogonojanaku.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/49687257126.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/zazomenej.pdfIn PDF document text
    • https://reniuved.it/file/8005045706.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bedf123e0---jezaromurajaf.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/wufovikexalurujulajakokig.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607164eec6042---lizivulexonug.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/61520048604.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f38e798174a98de477e25be390319ff4/zitozazarusazifusewi.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_off000124b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B4 17544 bytes
SHA-256: a1297cafc0203c37743a3663a8e58f7adfe218a8e0df5abd2a99bf1ce5f814f9
font_01_sfnt_off000152d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D9 10440 bytes
SHA-256: 72c6721079d9a16f967c557899f37c002b41d3742e13c5d76d0d3f1cefc0d858
font_02_sfnt_off00016ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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