Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78ba431f578bbc9…

MALICIOUS

PDF

157.6 KB Created: 2021-09-05 05:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2c5344d631b1d261d79e9c77d73bfa6 SHA-1: bb9443e2d564a0daba9ab08ed888941d8207ab76 SHA-256: b78ba431f578bbc98af96a27956982bf61d8f3018702b901e16a390e582e439a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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://stacjaregeneracja.pl/userfiles/file/47588544780.pdf In PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ceb906c73---sirunikukamazaserisewagi.pdfIn PDF document text
    • http://bscartridge.com/pic/57222449023.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/putuvarivimixorosibajew.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc23a844b3---45862217695.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///xefapujozukuwifonudo.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/12510767114.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160823872bf079---72394129440.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bcbb672f---keliduve.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7783e425f3---55517480589.pdfIn PDF document text
    • https://zzwgjx.com/d/files/buxagibaxagoxuwivinijanof.pdfIn PDF document text
    • https://digireg.dk/upload/mozoke.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0a13b0317---venasanatibozewed.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/25416511849.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/fepuluxerukebugagudul.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bc2404fe2---tijoxuwujo.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903f661db2b---baxubidojedotiteteda.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/nr5ao44m13g5rj6iodfh82kk30/dojonoguwakasafigerus.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c5b9fee406fa9d2a94599ed074c876ef/zafuzanuwibomis.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210612012516_hbexzt.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/38563800820.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/qckaq65h3mqhl5lumuq8ls7elt/piroxutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bhagavad+gita+chapter+1+slokas+in+english+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_off0001e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E528 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_01_sfnt_off0001fabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FABF 21952 bytes
SHA-256: 80c78288acd71c251b5c6089357c1355fb4e699f0c5d101827c5525340f42679
font_02_sfnt_off000233da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x233DA 11160 bytes
SHA-256: 7a144965f824883c332a114fc610f05994686299a091a8ddfa4d2948ec4302d4
font_03_sfnt_off00024dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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