Malicious PDF — malware analysis report

Static analysis result for SHA-256 531d34504d4adb31…

MALICIOUS

PDF

87.1 KB Created: 2021-09-15 15:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d0e3a19d94f7437c3213c1b262a0753b SHA-1: 739faf4b1a848b76518827e966b1e563c388283f SHA-256: 531d34504d4adb312bfddcec316eb1c3978ff0629ddc12a9b4c3d9ecfa5c6d96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links, some on compromised sites, points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://matao.ro/app/webroot/files/userfiles/files/wixanegojezef.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dif7fksifrmvnvddr40tuaasb6/mojap.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/55478311029.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/dafevopijapofobuv.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/wasetuzufujedipataza.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/39081757562.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/jajofujoxufekiwiwelaluk.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/jatapalakibekifox.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/bipurimasefamixezi.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/bugidobuseza.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/dunur.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/35827017825.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/figujejolub.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202197222342277.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/vujovifagefite.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/28655226091.pdfIn PDF document text
    • https://raljob.com/userfiles/file/91724853424.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267373e39b---wapoje.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/19526120317.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/lfamjpo1e6n1quq80eelphosp1/rijonamudupomuvijozamum.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/lugaruxaxotisimudegowid.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136d75e0eb95---fomonopukigarokazemejur.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/minara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=modern+combat+4+zero+hour+modPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD098 21592 bytes
SHA-256: 204997bbdc21b00bb19ee361490c8a07441167760cdb300f4272120dc96a29d5
font_01_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_02_sfnt_off00011dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 10700 bytes
SHA-256: 3e6ca44c5248c548fb4aecb605779c10440b5a1acaebd80dc8c630686e0b239a
font_03_sfnt_off00013639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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