Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed20900f5ec0b90…

MALICIOUS

PDF

94.6 KB Created: 2021-07-17 20:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 6f25cfa94e05755681a065c844d42711 SHA-1: 10982f7ac9648596d19343f59f6a7a3bd892e2f6 SHA-256: 1ed20900f5ec0b9083a624b8961628c26c1f4abfa35a051ff7dc417a366fd12b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://kasihpaham.com/contents//files/13536486020.pdf In PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/196ce3dee9f2e3038339fbb0829a00c7/mewibixikuzapis.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/qv186gsaivq4o6m636bp6bj59a/86863826792.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/36527681688.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/62790282708.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/jokewukunodud.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8scacl04hltl6r0oe588tcgaqr/84009466174.pdfIn PDF document text
    • https://preciseenergygroup.com/media/supovajowe.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/gikefusesalavugurugapes.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec062e819---watixana.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c002732c6f7---nepor.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/13677670411.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/85dac4e778672febe30b28d18862248f/76790288231.pdfIn PDF document text
    • https://begili.com/uploads/image/files/55936996320.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d223316d5f329b0425eda73d9a2efd85/depoxitomewojivukos.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b1c886286---favale.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/donevet.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b18953786c195b74fed8168b45ba32a0/zopamotiwawetadowodepimad.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/q1k6bb4gl9tr4usfm8knav1fjr/noxivirexupogoz.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/suziveva.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/fefogufojuteginaxagut.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/roreriwanaxudoripumefato.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/82405603762.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd9080e0f2---wopukuvaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sprint+airave+manualPDF 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_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 10368 bytes
SHA-256: 154716397c479e2657a32702c6d4373d274b662aeb04536a0e5b3eed79aa6b29
font_01_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 17536 bytes
SHA-256: 3c5d82817998b11ebde5ac3e0be2940f6e064d158e5e767ae750dcaea441759e
font_02_sfnt_off00015524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1