Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d5e2e9cd0a0c15…

MALICIOUS

PDF

93.7 KB Created: 2021-08-15 23:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31dcbddb067a5208db28a9cc4aa053a2 SHA-1: 9910f9ca377a00263596dca64b0a5c81f18486c6 SHA-256: a2d5e2e9cd0a0c157ed9e3c830bb95b853c4a115118c108fc48b2e0dc9c8c250
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://nfc.soo.jp/file/6316237315.pdf In PDF document text
    • http://makesomenoise.hu/upload/file/92848606129.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/83598361035.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/849aeadff2e15fb01d10afd9c6589c77/27836432703.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/72b0d5174800cde552ee37e260271171/zaviv.pdfIn PDF document text
    • https://ms02bet.net/contents//files/fexoxisetemowagew.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/1bssmc4liu9hlvk2jdc3hhjkli/45183542947.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeae08323ad---48046638476.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/mowamapunusitebadosoj.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8600520e32be874114f84c8c153d1808/pilugex.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/20725760319.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f9334109c43d2bdda7bc3fd8a41d5242/wozupo.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7d425acb5ba4c231619153edbb7b4732/22161824599.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856229f0323---nenupefasodoxiragi.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/17420200765.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/1b8c5b740e786e8600fb6c2b476700c6/95164557415.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160da79ae2ea10---degobikolidax.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098f40305f65---bademekodanokikunukabutaw.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1df063b06---50913839667.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021080820490773499.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/72461281075.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083aa13ae1c3---14240209865.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7d34c8c8a---zewewalutexakogoxa.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/4212713264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=manual+router+tp+link+tl-wa901ndPDF 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_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBF 18208 bytes
SHA-256: 61e6949faa2a387ffbaccdffc69a8fff6d2ca162105bdb99b509edf5d005a6b6
font_02_sfnt_off00014f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F62 10864 bytes
SHA-256: 6adaeae8d01645f70acf52bbeda1c2bec92d06ba5b0073091d2ae354e8d8fc8d

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