Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9c7c5bb87f31ae…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 18:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a2a2879f3d2bb670fcbbe285d5483028 SHA-1: 368352b0b530f44d26da7886a3dd1760b1a6443b SHA-256: bf9c7c5bb87f31aebdf74d8779629900d8356680c8b39fc21ecade85ae601bb5
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 0.9976

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://synerhu.ru/uplcv?utm_term=grandstream+ucm6208+manuale+italiano PDF link annotation
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a983ef812---gedavebax.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/mupapufivuxen.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e849ce498a---jumigapoxebewaga.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8471e9c46---zudoguziferakakigovus.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d18e7ea89a5---72806764907.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/cd5ad81df3d00c0dc77c6bf132495271/xajuviwitanepivid.pdfIn PDF document text
    • https://banghenails.com/upload/file/jevopudo.pdfIn PDF document text
    • https://ancoraeducacion.com/images/sujizalodavalik.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/83044335700.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021060414513473499.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f00e5cde35c909f96761a07b26e2679b/gowatufokexo.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/76nr5mt1v4vofai9o2mi5k2u22/zojigifewudisubomas.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wijuxovevawoxufumomev.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7370d659d---votipitopagizarekilaz.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//benalexotafixowimameru.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098127b45ab3---tesumonupumudakobovuki.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e125d024bc---daviwulakokurekozokirawa.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/69492667479.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/94413099857.pdfIn PDF document text
    • http://24cvety.ru/upload/files/622770536.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/mazedurax.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202108051815118139.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/gumozovizusigape.pdfIn PDF document text
    • 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_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 20540 bytes
SHA-256: 7cc3a1c88612dabea209feaf6c96b7279440345d8ad28a6d6c99c92c004c4447
font_01_sfnt_off000117f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F2 11288 bytes
SHA-256: f94a8b723dea7b7b2cd16576e15f0a82fd38bdb8a9c27296bb64bf3f75ffc66d
font_02_sfnt_off0001327e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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