Malicious PDF — malware analysis report

Static analysis result for SHA-256 a098b54b5f0c3e3f…

MALICIOUS

PDF

77.1 KB Created: 2021-09-02 13:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9c2492dc69585a349e8202d73d1ac53b SHA-1: dcd8b90afb554472b76e1bbc686d1660623a906e SHA-256: a098b54b5f0c3e3f71632942e0a2c8d7dab8a68f0805022000df8bba775d2449
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics points towards an attack pattern focused on luring users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=bachelor+of+secondary+education+major+in+english+pdf PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160962f24bef53---21392516639.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7ba585382---91707816699.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/98416727546.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf6cd01c49---65162238342.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1858c3a0ff193ba2faf8dccbea6871e3/44927921923.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/zowobatuzaxonifow.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6930063c4d---12728116123.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/52464884052.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/1o5uvo62maan8iiel7dbrcudkd/jegemanalubaneriv.pdfIn PDF document text
    • http://agro-partner.com/Image/files/niperubovoxufuxapukivusev.pdfIn PDF document text
    • http://asvpp.fr/pdf/16009446388.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/rasez.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee53b237e9d---xavoberinuvikosole.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611faa64873c1---linawa.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f427df93a---27987206619.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610108c748abe---52040395612.pdfIn PDF document text
    • http://eventechsite.com/files/files/70994648416.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f5491e3a---83656319312.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/xilazasirizubofatulitanap.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/71663992080.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/48475590593.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/72685601653.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af25646228d---7776564058.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210727224146.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/monubuvafidululenamukudig.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_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 11464 bytes
SHA-256: 51ec2f5cbb671249ccce146236a6e61410c67bb9a4db3ab2d6e90c688a27ae38
font_01_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 16216 bytes
SHA-256: 46dd3371956c75fb2e894947cbc7067d12fc898e0eeab8675c2827e85dae1b3a

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