Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b13c8366a4410d…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 06:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 03934992651e1d2c3da146c226b31276 SHA-1: 205e70235f459eca570821a9e514d8a5ea723c8f SHA-256: d5b13c8366a4410d0edbd94e58152bde7362978ef895545652b4b36fc03b49c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malicious content, likely a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9709

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://angkaganjil.com/contents/files/23881597923.pdf In PDF document text
    • http://lex.tj/img/file/64530170540.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614368b07479c---2561413400.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/laxivituzoxuxotivexusuko.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/zisuramodixowodutatezitag.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/2556050656.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/metovuziw.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210910055807.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394b0656b88---91856447550.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/gujobital.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/487479343.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/babukape.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614103e11bb06---61866527541.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/namazolavupugole.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/xowagejitobonusevupaxamo.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/wufomebovenopanenof.pdfIn PDF document text
    • http://brenderup.ro/mm/file/5167650559.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/midegakaputavavofevu.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/29403882987.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/besakevoxizututusebewakex.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/renesevitenijizikele.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/87074455905.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/5481382918.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210910124247.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/nuwoxamap.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435ecbea272---44080504454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=install+core+gms+packagePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC46 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000c43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43E 23040 bytes
SHA-256: 726660f58aafd73e57159dc79efbd02d36f6f1e11e7d2cfa2504fb4533b75a4b
font_02_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 16376 bytes
SHA-256: b401174fbd2c4d6f4e8d7b42610a6ed6f1b6b4fe384979ff07bd201e6c39d10a
font_03_sfnt_off00011438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 10668 bytes
SHA-256: 0e801375887576b2a1a560910996730a3d0ecea1776d7b9ebf164d1270619506
font_04_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1