Malicious PDF — malware analysis report

Static analysis result for SHA-256 5241d09dbe0bdd58…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 18:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 952622b399a661ed52b6a5d016d4abd4 SHA-1: 63032ae38724ac2c9c4c480ec4bc1b6db580fc60 SHA-256: 5241d09dbe0bdd58e6f4fea5df062d928993b88fcbfc677b5855b9129c9476ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the final malicious destination. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://inwebjor.ru/uplcv?utm_term=how+to+remove+bloatware+on+android PDF link annotation
    • https://iva-vietnam.com/userfiles/file/38608286198.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/24453772300.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/zixosaromoxirasokera.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/7080681011.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/9c75232adc34aecd5ef52e9b06832c79/52317076555.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/fadifevefuwuzewu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490fe14e3b9---kizumojowit.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/lexizewiporixuwiwozezuk.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/pivijup.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/hfagoptkj5chkdsorb0ofgn1n5/93336971916.pdfIn PDF document text
    • http://atya.eu/files/file/pefowineja.pdfIn PDF document text
    • http://secoinblock.com/upload/files/fagowomelakege.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/ragobobaderipiwokug.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/lusoxedogaxedozudavozuvi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e4e59d75d---ruvodenoxid.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143c22d37feb---topugiwegumab.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/80647498698.pdfIn PDF document text
    • http://anpo.vn/upload/files/58604243850.pdfIn PDF document text
    • https://gsc-tw.com/userfiles/file/geburevajibuwezi.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/81290698537.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210924015036.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/zenosadipetogabibo.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/54981220714.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/49809511654.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/77017602072.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_off0000b652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB652 10524 bytes
SHA-256: 211401086e3e73f3aaa495475beb6adeec1039ce566b6c46101146c76108df81
font_01_sfnt_off0000ce3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 17272 bytes
SHA-256: 5970ff07b724b0a4b0295f84b6b5c667ae3c24a61697898e51428607aa327be8

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