Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24885a1c33322ab…

MALICIOUS

PDF

83.6 KB Created: 2021-08-26 13:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 79a63bb6c366f2dda9e661fb58a768fd SHA-1: eae075eb0e551698da1db1ac1759c2a1be59fc79 SHA-256: a24885a1c33322ab2db6629d03b91ba2836a87dc7a3a668453fc18250a5ff792
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are identified as compromised CMS uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xaydungdonggia.com/app/webroot/files/images/pages/files/nuxakozigir.pdf In PDF document text
    • http://occahomesearch.com/userfiles/files/85820604609.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/fizamala.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/63959108183.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/75780912517.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/14350562895.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/0abrj0h1ag8p86al2qi8bggmr4/kifafiwoweredalamuzuban.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160fd92c23e233---fuvabobiz.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15bd41e596---wifudepijemakorokaw.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/2704818881.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ad13861f---48224245960.pdfIn PDF document text
    • https://samowar.ch/upload/file/21706879339.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210602174654909.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/25146820223.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210720_174527_7873.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ae8fe331dba---73125632406.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/414d9ecaf56fa0796041be1b783c9a50/kugen.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/31842831739.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5e1057c62---31369849976.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/kuwusasupaxazisakuxer.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/kugabi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf8c188e43---81103965102.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/wojumejegugilorikufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=costochondritis+that+lasts+for+yearsPDF 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_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 16552 bytes
SHA-256: 0139a51dbf60ac23730920aa002f951978f3a2c2e8da970340d941aa4d7450c5
font_02_sfnt_off00012748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12748 10716 bytes
SHA-256: 670eaa39bec91eca5c00a94bc7b0c4b6a81d8c500f0163ec274e65a679aed098

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