Malicious PDF — malware analysis report

Static analysis result for SHA-256 b170b78f51ea4cea…

MALICIOUS

PDF

87.1 KB Created: 2021-08-07 12:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: aa43f9e03fe42df5a3ff7204988468a8 SHA-1: 4d9945fe2524ad203ce22a2ede0aad120b46093e SHA-256: b170b78f51ea4cea842f72ac90c6f2a9aab0e280969ab39c4462043d1442ca22
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to host malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the document, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/a4840874e33b5ab276e36f86eb373ccd/toruwosojofikesa.pdf In PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ohoq0j0tug5mscadjmprems18p/75347822532.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f462e27ef43---12044343755.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/26514989128.pdfIn PDF document text
    • https://stavbyhes.cz/ckfinder/userfiles/files/dafumiganonivibor.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb05026682---kubaxupijoniziwadifir.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3364b716aa---56806346376.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8d24223c2---28305281200.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/53339375173.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/40050217610.pdfIn PDF document text
    • http://voorwindenotariaat.nl/app/webroot/files/ckeditor_files/files/21565556458.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d858f392e0baaa0fb662cb4523945fda/99800888030.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/36513435155.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07e51f340---wemubefil.pdfIn PDF document text
    • http://builderall.info/userfiles/file/96522718933.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/69938277313.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/99758800661.pdfIn PDF document text
    • https://digireg.si/upload/pebuge.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160947ded326fb---penoge.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/399191277c7655087b5223a66b326a1b/xobijorupaletowatutoriza.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790c885466a---pivedax.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/38007553227.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/dixomak.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b2b6a9636---kuxokunadugokafesapomopu.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/40534133775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bise+lahore+matric+result+2018+gazette+download+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 11868 bytes
SHA-256: 4bdb8f6982601cfffc56ef9bd261ce1d83b3affcf69d2758b81a523a003a6a53
font_01_sfnt_off000100d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 1900 bytes
SHA-256: 1b006c407589fc9252123cc51eaeb5c6904db82ee47faaf52b2727a7571a5fdd
font_02_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 17044 bytes
SHA-256: dcef9dbb1e81ddea3959d77c9f8c4937b11a66ccb2ac0bd54f55da463cc52b3a