Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff871dfee04854a…

MALICIOUS

PDF

89.0 KB Created: 2021-06-29 18:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 701fdd87a8bb6d7a9e79f30971c03dbd SHA-1: 4bfcf16f45a9a60314d99a5c2d333d680551093e SHA-256: 5ff871dfee04854ac562615522c3902ca03b656cd97ed04ee53252b196edf6ad
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or submitting sensitive information. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/oiir10psnf2bkao9lt46rob6pl/47653441316.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8fec79535---kazikojil.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/73508430304.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/9243ec110be91650a31ec75cd1cada01/42661231567.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/49ca23270d030bca531523be2a4f504c/20814289293.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021062816204173499.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fda41156093153e1935854933289a5d0/wesemimanix.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/luburodop.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/32047841889.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160749a54cc953---lorakogukolo.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4c6839d3b10a19ac9836f9ce3ed22c3b/62606490934.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5faeff56f8f209abf4cdcbeb604adc12/zudureliroxepe.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/3b1b098ecc9ad48242fc1c403fe4eb75/66037045938.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/h6b4iheelv44or1ls5vlkn0vbq/zazagigerupudikikujeduge.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/97i59vo3oep411klev9mcogov2/womulovomaduzopumuki.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/85418492090.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/fefa9f7d2c251d7155f12b9e817f09b5/94365137179.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/b7b5ef43760c9b09d8bf06f98e2b61f9/sosinedijunonoda.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/75254687709.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac047dd3960---56736137668.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/21303656398.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/paxodeviduwadazafarenebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+r2d2+an+acronym+forPDF 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_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 10788 bytes
SHA-256: ecc132e676e254e697cd4cd6ffd1c88e38508fde535285df5c70f62ea76c6c36
font_01_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 17432 bytes
SHA-256: 8182dcc68aa62c4a5e67050745210416fc6f3df680c8a9498d3ba2371ae1e891

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