Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab704ff12ff38941…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 11:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9448a54d0791a8e8a21815d3b343c12e SHA-1: 897cc7b0825d1036d38126e212544f391c3593f8 SHA-256: ab704ff12ff38941b48a6195825d3748ee4ad5d6ab74fd963c7252c390521807
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites. These links are likely designed to trick users into downloading further malicious content, potentially leading to a second-stage infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 5

  • 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://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457adde3a1c---suxuvokemofixe.pdf In PDF document text
    • http://tehnicgaz.eu/files/file/dorumuluxefu.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/78354087829.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/mitiju.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210910143335099716m6e1hzo3097r.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/valomegolopimumisufemodaw.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/0tah3hdabrk22tas3ljodsvj34/jumodefivipepimu.pdfIn PDF document text
    • https://skostishoes.com/userfiles/file/34621351759.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/61207087814.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/49037117373.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/pomaxulemoluzabuzezasopeg.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/lubemikewabe.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/tidutira.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c8c9dc44311dc9a709c798fa66fdccb8/letumuw.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/davifurab.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/75979002644.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u8436vqq8tsj91smm3oo5d8uq3/zozizafitud.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/17458798594.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/xodinavaf.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/88429319074.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///zobaguxo.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/49238313424.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/gugek.pdfIn PDF document text
    • https://e-midas.ro/files/file/majeregewakovenezeg.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210910173256_385078439.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/lexedajebutebedekadimup.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/kufekunemuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=play+store+pc+windows+7+apkPDF 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_off0000b32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32F 15616 bytes
SHA-256: 07b6489c3ce9b64673fbe234b540b64dff3026ce369467c632b55d7c91dc9f69
font_01_sfnt_off0000dacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 10848 bytes
SHA-256: 305cabcb0e9d2c26a5f2f41d440187e16d890c9e69d1ed11c09bfafa5b57b2e4