Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9a3031f6d3bd04…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 23:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d6ad30dde9c07121092e489e576ea7bc SHA-1: b0f0575cf203166f993579231d5fa16ae4d522be SHA-256: 9f9a3031f6d3bd04a04fec43a07115a90b0a13aac882bebad9add6e933221c02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://synerhu.ru/uplcv?utm_term=oki+microline+420+printer+manual PDF link annotation
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bdf25be787120716c9806144427bc88/95887194467.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b465e9b4e9f---75870270714.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/59378013908.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/tigifimuzijexarab.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/21924255345.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/welavavemupumilodojon.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/5484905392.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/12554754833.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16084be1c795d2---88787092184.pdfIn PDF document text
    • https://mavibusiness.it/file/25616116209.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e0005ff7---14565733908.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/57886676047.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b0eba7a0c---bugiwose.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/rtfnb9f7o1verepan9g9gi7skj/gewevemoxewelonob.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9c340a912376706a3aeeeac1dab39bdc/burenulajumotab.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/5758714656.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210628140519448.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/26840884500.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/74156385884.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210715162045.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106201222085479.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/akgrqqg6197mfakk5tm5shrfgh/nizukij.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/86787860250.pdfIn PDF document text
    • 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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 10904 bytes
SHA-256: 44470f4d4fa93f5af20005a9c1dba968ceb3b378cb34df3d1adb1e8b09be9bd8
font_02_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 17396 bytes
SHA-256: d5da2f0811b53bd92c26886623a0242b23b15e0887b048ebaace38059f7c85d5