Malicious PDF — malware analysis report

Static analysis result for SHA-256 361165287bcc6d12…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 14:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7c055748b80d1aa384d3a42a3f02473 SHA-1: e43c646842db8be2192e60ac7457cc50030643a5 SHA-256: 361165287bcc6d123f6646cf5b24bf934f096a992e623b2c4a4e47dff1a98d66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://naves.cz/res/file/sesawexime.pdf In PDF document text
    • https://efsanepin.com/calisma2/files/uploads/33392349563.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1936779451cb3cedadff367039a1f046/fiwijosis.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/379a676c17eeb3d7eb5c8b8ad8b59556/38018635287.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/17565532187.pdfIn PDF document text
    • http://chemicalengineers.ie/images/42417900462.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/podibamu.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/50432216089.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cfa3dc95c---gorupitoratebajagumabewa.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/nasatelusonivirupewo.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/febagifeno.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/bazibo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/mozelosowigilumifipel.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/139afa282c44f9f76a2323bac703f809/59950205450.pdfIn PDF document text
    • https://tantecoccole016.it/file/kuwutizaguxu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-29/20210529081217987396.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb50dbcda0---jupot.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/751318538.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/40520653269.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/89df254378bba60a93c3dd7abe99bebb/69868395580.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080dffd1d0f7---vusajidotuvelisi.pdfIn PDF document text
    • https://birudongker.com/contents//files/96202485414.pdfIn PDF document text
    • http://garderoba.sk/images/_file/624258122.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/47372079335.pdfIn PDF document text
    • http://envigest.cz/upload/file/lurerore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=equipoise+meaning+in+tamilPDF 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_off0000ceb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB4 24136 bytes
SHA-256: 575191c432c4883fe0b2846e18fd2a106160a0b7db680e0aa8104ebfed9fb3dc
font_01_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 10724 bytes
SHA-256: 74f49a246e57aabc3eae085b7061f872fccee46d5774c165f007395c159b123b
font_02_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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