Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d423454915ade7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-22 14:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c69f5f4e4c58d566e5a19acbb8920aa3 SHA-1: f3af7ea45cd9c1ecbea4910c67491f92aaf3baf0 SHA-256: 84d423454915ade7eb82bd7753b609b9289ab39bad151db7433d494374b84faa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various download locations, some of which are hosted on compromised websites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly indicates a malicious intent to distribute further malware. No scripts were extracted, but the structure suggests a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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 https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/38910144929.pdf In PDF document text
    • http://zgic.ru/!upload/files/kodopimevelosogagonuf.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/davifupilelamipijogudig.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3270b53c598a49873258dbadb8f789a3/58021401668.pdfIn PDF document text
    • https://breedlife.com/upload/files/54502090881.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/20205433959.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16136dd4ba46c4---92599728460.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/80247338493.pdfIn PDF document text
    • http://skene.es/userfiles/file/zafebifototalevomelorid.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/47956774973.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/xetiv.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/rimezulakapu.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/23099351930.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/73635483263.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/78133648730.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/gawenomiwivilo.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/4849606446135bd78e1de7.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/2229759152.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/nokikezuvaruxa.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/kegedawulo.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/fodixawukotusovomepab.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/52a3d16d4cfa8528544ab65301026f92/53057995051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mp4+full+movie+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_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 17156 bytes
SHA-256: f08b162b935f7f9168e63c22cfea3fcaeb915cbb7fff14495cfe72b94c716971
font_01_sfnt_off00010221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 10616 bytes
SHA-256: 7ad4a2a89cbdf30a7c706c0be22100646226b354dead8f9eefc53b3264f61626
font_02_sfnt_off00011a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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