Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6247320fdbfc30a…

MALICIOUS

PDF

90.2 KB Created: 2021-07-02 13:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9f600b15fd1b6aa77feb10d9c35e323e SHA-1: d4c8c24ae2ba913cefbec9b524093aff6622f0cb SHA-256: a6247320fdbfc30a02853fe12d1a8d17feeeb4ece32fc3eca5d54287b45e223b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malicious content. The primary attack pattern observed is the use of a link farm to distribute malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://zdravi-kromeriz.cz/files/file/zafaw.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca03669066---41348460711.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/fimasemono.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/bobiwowosoke.pdfIn PDF document text
    • https://schmitz.cz/res/file/dikasoxajekuganepupegikar.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e08ccc5d---60687559902.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e78ce8e5b---musulokit.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ed3a15a39b4cab0ad3799959bf51846/nosure.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/23064133015.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5069c5a94c---24371422162.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/18463951335.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6a7f27d08---78312893505.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/99429005506.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a7de657890319e7305d647c3f4f4d23f/41644797968.pdfIn PDF document text
    • https://stopserv.ru/files/file/suvamidexenoto.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/nazixufogodebez.pdfIn PDF document text
    • http://consade.com/userfiles/file/91047639072.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/18362365954.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf93fd88c1---2758732018.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/jelulixogasiwafogab.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/4qicqq34emhabc2ck5h4ium0rn/dijun.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/90k1v1jjjhnuhiq5gcnhe92ro1/94558293494.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/tubakibonukubire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ned+flanders+interaction+analysisPDF 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_off0000e7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F2 17284 bytes
SHA-256: e5c065fd40d3d7ba579eb2dbcf645c15ab6473809ebb5c6bfb971b8812fea554
font_01_sfnt_off00011573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11573 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
font_02_sfnt_off00012ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB0 10560 bytes
SHA-256: fada014440e84733de85004dedb00e94e36f944b5fd8c73ff7dfdd3849932fd5
font_03_sfnt_off000142ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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