Malicious PDF — malware analysis report

Static analysis result for SHA-256 82371e5ec85d002f…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 05:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b8098ed6985ed6405559a6b7779c7f2 SHA-1: a8afc2c242cb62ef26099741aa36187eba4d077e SHA-256: 82371e5ec85d002f934062e6a4433baa9df5667f422b7428e738483d16a1a748
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous external PDFs hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external links suggests an effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://childrencareandliteracysociety.org/userfiles/files/bexajevotesekok.pdf In PDF document text
    • http://ylgems.com/file_media/file_image/file/fuwifovenimidorut.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/wozowejumezeredisunub.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/74661642851.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/dekomene.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/givixokepexa.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de5a391e8---19614902486.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/durilabanalef.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/28889754017.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/joturenupadem.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ca6d38399---46577147923.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4f26dc4cef3288312885022485194268/71058180459.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/jofiwesozabovowiviwipozu.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160959ef3098df---volokajid.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/tipazazenulibivopemalano.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/276223be40c6104b5bbcbde80eb59563/92850493707.pdfIn PDF document text
    • https://parkettworld.com/upload/files/55617862617.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/bizofexajibomefiwo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099e83568ddc---jujejuzazojugodoka.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/62257080793.pdfIn PDF document text
    • https://schmitz.cz/res/file/9723275508.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/02da992d183897189c22d38f63f1bfbb/sofotewigaj.pdfIn PDF document text
    • https://inncredel.com/uploads/gikuru.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/koxozamunibilijufob.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/wijuzad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=white+terrier+costPDF 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_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 17852 bytes
SHA-256: 8b1bf23ab7bc8872e615df8b041372881745699d17956a3a04f1bae66e00b0d9
font_02_sfnt_off000130b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B1 10008 bytes
SHA-256: 6309c8005111c9bc57d74c256c3b528ed730a094baa316b7f2c57989b7383a2e

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