Malicious PDF — malware analysis report

Static analysis result for SHA-256 043fd5f761810255…

MALICIOUS

PDF

92.6 KB Created: 2021-10-05 10:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 482b15ffe7be41b8df7be63d2cb0b238 SHA-1: f25c98ece437467b1d9247400b6d93ae2e1958a0 SHA-256: 043fd5f7618102554079b7ae63880dfb6a18f12879932f95bac6d4743b984686
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves tricking users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://wccflooring.com/userfiles/files/voladawinuzel.pdf
    • http://dermalab.pl/userfiles/file/1531205269.pdf
    • http://thamdinhgiadaiquang.com/img/files/vawuzemenerudigopefum.pdf
    • http://asqcert.net/files/files/renuverotedenukelabig.pdf
    • https://bwawarszawa.pl/upload/file/sotifeg.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/fomizafugamu.pdf
    • https://aarushimukhwas.idealviews.com/userfiles/files/xojexugijapazeludipiw.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614a07ca3ef10---dalexuzo.pdf
    • https://adian.eus/files/galeria/files/35378858266.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1615a26f56056e---japuzagirafazasusutasoluj.pdf
    • https://checkmavandon.com/asset/site/files/dezugalozilonitomefiwen.pdf
    • https://rafautama.com/uploads/file/xumobepomadimekug.pdf
    • http://tischlerei-schlusche.de/sites/default/files/file/32891110631.pdf
    • http://defhjdrjioo.friend-match.com/upload/files/gevenev.pdf
    • https://centrorevisionimonregalese.it/file/69929989982.pdf
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/71746969783.pdf
    • http://ruben.pl/ckfinder/userfiles/files/81113811300.pdf
    • https://luckyfood.itweald.com/uploads/files/614f98aa8d1ab.pdf
    • https://chasehr.in/userfiles/file/82929673083.pdf
    • http://www.examnotice.in/uploads/files/miladovoloxal.pdf
    • http://maychebiengoduykhuong.com/media/ftp/file/57901724232.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecc10527bf---56719110357.pdf
    • http://guss-ex.de/uploads/fck/file/sitejawuramored.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/zorigovenafodupafevasit.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+us+constitution+a+reader+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001010a.bin
dbe01048eaa443d5c78d8ffb8d72e80218ea477e4cd7d9148d19de78d163d302
pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 10732 bytes
font_01_sfnt_off000119ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 16792 bytes
font_02_sfnt_off000131bf.bin
1219d7bdf17d191ce7181316aa7d7c5c2df04480cc138e0c4ddb7762bdad7b43
pdf-font-stream PDF embedded font (sfnt) at offset 0x131BF 19516 bytes