Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfd71c79959b226…

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 02:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2b70bac5c4b82d4abd3a3288e73bc209 SHA-1: 996a49b5da24c8fffde9cf3526bf2720f9da6b34 SHA-256: fdfd71c79959b22607df29684c32750c089df4c0ab612068ce51e1f4b953c8bf
216 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous links to disposable hosting and compromised CMS uploads, suggesting an attempt to distribute fraudulent content or redirect users to phishing sites. The document body is heavily obfuscated and unreadable, but the heuristics strongly indicate a scam or callback phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://phillipsbricksalumni.com/clients/56168/File/47583437716.pdf In PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/nosaliruridimofa.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/774049d45a688b2a016181fc76f30ee5/fobelejipodi.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/luxezubobamubevunudata.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e7dda1e3a5dc9b35d116dbdecd743869/93174402400.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/18afcf29f092cfb44115a784fa3bb11f/26133620688.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714fbbc06f8---ruweziv.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090307b951b3---27118109645.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4356a1d0e---joluseselewun.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b477f652bb6---37667149709.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b9abd7186fce237434b6b555ac5ba22b/mumarufak.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/7970866975.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/12785975269.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d43d3e660---78487099866.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f1acf89a---79533970992.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e8ca6d80---sopuvadavinipelezenenene.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/179f5bb1e9618a4aa4be11d651b40dc6/21601002491.pdfIn PDF document text
    • http://01host.ru/userfiles/files/98644777064.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/pevutolunipug.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3251376e---12459091312.pdfIn PDF document text
    • http://allycatering.com/userfiles/59916174658.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///95538618683.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/50536987759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+difference+between+headphone+and+headsetPDF 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_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 10892 bytes
SHA-256: 180a226f6954117162a998f56a43ae1f89294d6cb2caf0be9283fd7d82e87b32
font_02_sfnt_off00011c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 17656 bytes
SHA-256: 5cd2d4bebfeefc27f5d642e98d6f139968b8810a92a0856fb1bb65e9e099ec2b

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