Malicious PDF — malware analysis report

Static analysis result for SHA-256 10867a9405d24dcd…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 23:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f709cbbecbabfffcd88ba3c9f0419aa SHA-1: 2852e7a0a9d1fcbcc91da327c0fa91333b13cce9 SHA-256: 10867a9405d24dcd0e0c337b0237556006ed290dfeb7b630c0c6e7019b3d49e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://floramarble.com/uploads/36418382328.pdf In PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/tejuguxutikanukalufipin.pdfIn PDF document text
    • http://htcable.cn/d/files/gutomezekirolujuxari.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/13664389369.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/sevegojuvepoxex.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/20385942208.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/29992613889.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/fagenisagawuk.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/12251593889.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/4230645844.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/48755986330.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/finakegami.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/71660037736.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca4237827---rumeberolorusogizolonija.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc10c98d2---20690894316.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbb84bc3a---zinibigevujipi.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/22425809783.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210909_195147.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf6929f77---sexuxasanututuberuv.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/bipidafodova.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/61062319297.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/60688650613.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/81742491458.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/33867695049.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/novufifunagetivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+claim+pokecoinsPDF 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_off0000d73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 10604 bytes
SHA-256: 09248b4a2fa5871fb0834089b34fd40f15062f0fb8003cb8271388b838a82a91
font_02_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 18140 bytes
SHA-256: 64ab2bcf958f692a2b807994745a993784665d9b14763f1f90ee8190acfda67c

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