Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b43b9c57555893…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 21:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9cb99a25e5242c3350af744037b20fc SHA-1: 29825bc152d41f6e633cde49c292819a983d0f48 SHA-256: f7b43b9c575558935301555a855b23dc08b15a288ea8c2aa09b4807591d514bf
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being part of a link farm hosted on compromised or disposable domains, likely intended to trick users into downloading further malicious content. The presence of a 'download button' lure reinforces this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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 http://awfiowv.love-mrt.com/upload/files/32967315485.pdf In PDF document text
    • http://zajazd-broadway.pl/galeria/file/vigiwimipinosuvifimoni.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/gipuxematajuvisekixala.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/mekuwoga.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/5856876297.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613be120c8f35---wolije.pdfIn PDF document text
    • http://oilspecchem.com/files/54979318871.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/kepiditodoguruvuli.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/korofulimamafelujug.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/59037452161.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/66369894609.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6ce1ec65---wolod.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/77345516991.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/jawolinuxomupadaxedum.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/mudeka.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d8f413138---bogikumemijamuwejuzosup.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/powebajekofu.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/94849618993.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137ada3de063---xemub.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109180343496462.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/zodonutixutajiletuzisa.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/56081169805.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/55993521438.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/3839048974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=norman+lewis+word+power+pdf+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 18976 bytes
SHA-256: 936e11cf9ba612ad9ea9b50a9debb521d2dfa9607b482202ba6e12c5815d7a54
font_02_sfnt_off00011422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 10624 bytes
SHA-256: 11630644056733cbf43bf68e4eca4228c6f6bcc1b0929dd4fc3e62028f148f4b

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