Malicious PDF — malware analysis report

Static analysis result for SHA-256 827b4bddfda97fda…

MALICIOUS

PDF

88.2 KB Created: 2021-07-31 08:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dda7d2fb3c346a11e530a63e074086a3 SHA-1: 087028b09fe20937314dad69ac2a838b42eb02ad SHA-256: 827b4bddfda97fdaec6a3b11f748b0bfe02cb4dc35b92601cd1bed6f0182eea5
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised CMS platforms. This behavior is characteristic of a link farm designed to redirect users to malicious sites, potentially for phishing or to serve further malware. The ML classifier strongly indicated maliciousness, supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://chupwo.com/editor_upload/file/61586842136.pdf In PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b95a30cb57---49484902853.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a22da7752d7---datajefirunanikofexigelij.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/wujap.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/xebanotetove.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c0ca41dfe---juvefamakaragigub.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/14450059754.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bq95o5mm9oq6luikuapfv4kck0/menuzopinumakobel.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/61092422025.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210620_235948.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7899cfd6b---79854172606.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/ponuzipewokagove.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/wixufezidalofimosed.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/rodedamubojofe.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/62875395071.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/49309957674.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b4285ab535cb665aa9f076ea6d327a13/lonukab.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/mewudakaledo.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/guwamumonufewugedudu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7259eb68e0.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9510fcce04932d23701dd5675da69fff/todunepedov.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/jetuwapuxijulemiwavixa.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160757f28ba2cc---pojovopov.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e851052d---19350547796.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/98968948276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=lingua+latina+per+se+illustrata+exercitia+latina+1PDF 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_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 10640 bytes
SHA-256: 446155ca1c00e296cc2ad4167ff1b994e5516f108bce13a4750c943976679ac4
font_01_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 18152 bytes
SHA-256: 50f2bafc29ceffecb4eeaed3dcd16516045e5b8037521a81a7a5569b734c31aa
font_02_sfnt_off00013973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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