Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4d7a1a0ea84807…

MALICIOUS

PDF

94.2 KB Created: 2021-07-03 15:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f971f09a96b2c4bf84886eef92170aab SHA-1: 12e5e6ebaf63ff747797f8d31e961401295eaa41 SHA-256: aa4d7a1a0ea84807ddf38631055498081c256b243f56f9381931fbe530c93a01
136 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for SEO poisoning or phishing. The ML classifier strongly flagged this PDF as malicious, and the presence of algorithmically generated URLs further supports malicious intent. No scripts were extracted, but the primary attack pattern relies on directing users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/iobe1hls29615lmlfcn8tbk9ht/ratibabapepubajetovona.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16072631c7925e---lutulusulukapuvopadu.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/13512051529.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aef02eac8b5---favarazivivofo.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/81384526808.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/57931434362.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2b8d6cac2ce5a4bfdf11e6cf1b310fc3/buvimifakalogezamo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb59f78987---jipafoxozizopapuvotunupoz.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/ditubaw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d158d4970---lujapedipoxew.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160729da7d5094---janasafajupabotigitufa.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/54413898336.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac893f188bc---3878709899.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/5rp2giccqntrfmmp8ae33qrgt0/zamunifumufapowimedin.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a0c7469aa---19924089913.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/mmkkc787lf6d4abs10rcn5306v/vuxexojil.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ab69907704cc8d028882384cf4cdb673/zibasi.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/61200227413.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/vubugurisapekavuvi.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/b7e3270d74041021aad5724e29ba82ad/1689132108.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/550144ecaa3a29771ba8bc94f2bc8025/52668957842.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/df2a824cd341bb350dda3e5f5af05db2/59221114445.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/amgai559pho9emo5hmbpv36pq3/19847195310.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/42ff248d011d0911f800a188d784ad22/87153593169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+usb+webcam+app+for+androidPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 11112 bytes
SHA-256: 8d1cd57ebe3da1f3d84cde31d1c2afe0ab61015e237da123b0696e5a874be1e5
font_01_sfnt_off000126a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A9 17260 bytes
SHA-256: f7479b12b2df44c4899cac49d8f2b02dc96dd128b9f7bdaaf9b7c5933687a1f2
font_02_sfnt_off000153a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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