Malicious PDF — malware analysis report

Static analysis result for SHA-256 a232641f039a15d6…

MALICIOUS

PDF

91.8 KB Created: 2021-08-06 22:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5bb1292a81d714724cf507add3d606b3 SHA-1: 40dff63a517ce569e1da63d1b0463acdba5299d8 SHA-256: a232641f039a15d605b0575481326ed20981279e0391cbdef3aa95313aa878a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document detected by ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a69424188---1660012703.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a9825fbc4781c2ea5ac737071a143c91/fivixiwe.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/disekop.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/44399574647.pdfIn PDF document text
    • https://morabia.fi/images/file/didelijafujarilelapos.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda744396a---batirurefafudelikosakus.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/48957218125.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/63983252366.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbf5c77592---60627305020.pdfIn PDF document text
    • http://fitviewer.biz/files/file/79488360251.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a092e07b0bbb3260552247f69a6941c4/87749863566.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5098335eb---58146511202.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/48120537548.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/56476hnul2ee9k8okjjdi8nbb1/welorerikafofezasibefiz.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4e7cc74cec07d2d913b4646c962ef76c/40787254583.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083881b446ba---fogetumusirosavul.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/bb21804b4206fc962c3892ec8359b757/weluzesupetefakagodabu.pdfIn PDF document text
    • http://techbis.pl/files/file/taxapus.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b369a47e---xipitosodebezivi.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/11622923418.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad863b8f049---3949050411.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836eb4f453---panenero.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/28650216396.pdfIn PDF document text
    • https://phr4u.com/files/tejuwub.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/larixonimem.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d2aeba49cda---disekenidubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=actividades+para+trabajar+las+mayusculas+y+minusculas+en+primariaPDF 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_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AA 18560 bytes
SHA-256: b8fa3c68c77d81306ea1c10ca83ec9875d7e65753d14242d2ea5410e12faf6d3
font_02_sfnt_off000146f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F0 11088 bytes
SHA-256: ad88577249f9932a76fe65425dd29c04814961d7aac8327530774ab6192c5b03