Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dfb8c5ea97f0dc…

MALICIOUS

PDF

104.5 KB Created: 2021-08-10 09:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: e20f06249f7c0db514ab87c286f1b400 SHA-1: 46530aef1f60658181b11b2ef66b7dde57c1bdbe SHA-256: d5dfb8c5ea97f0dc95ac071c9193306ac8d6b4aba86a5efccf74ce5a7715ae9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=beginning+%26+intermediate+algebra+5th+edition+pdf PDF link annotation
    • https://pingthye.com/userfiles/files/wesafunexafum.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210624115826.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cc1fa6763---71868179961.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/66922617885.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ieug5k0g5aqg7ubo29p21mhct5/70205717378.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/80723124109.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfea1e7c42---lidomopexevoti.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6tlb37ggsct7nv7bq0ccp7sef3/ziwirefa.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/f003812bb470e5821bf614995112c66d/dirurojalanexudadejak.pdfIn PDF document text
    • http://staropolski.net/Upload/file/saxekatubetelaba.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/pewaruranowapuxu.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/12947085388.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/36913848678.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-20/20210620195636317419.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/6dof8mrr11sh1ekhpbb512rq0e/babavuvikenonimujixiz.pdfIn PDF document text
    • http://rhondachem.com/d/files/lopilivuluretojod.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a63ae742bd85b8824f94f95b1a1e48cc/2009015951.pdfIn PDF document text
    • http://liyangah.com/Upload/file/luladozonexexesewep.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2f9gtbro1abv8gotkoh5h901hb/fuxovinosup.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607015eda3507---ratudelo.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/nakuxegazerenobab.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/64414ee537458f0979e1571bf74a3044/demem.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 21492 bytes
SHA-256: f324801c33c25ca6ff409bd768079b554b525177eb0839d8f47c1c473396592c
font_01_sfnt_off00012d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001458c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458C 9636 bytes
SHA-256: f6a782dd78746179251c61e483ec59a140cbd72df2980eec1ea135075cfffc3c
font_03_sfnt_off00015a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A71 17752 bytes
SHA-256: 7689de205dc4da3ed5009ef7ce7a4150250252d1b21d11032a50878951692d54

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