Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fedce852a97df9c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 19:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 923e127b06a1225ac0139e66373342a2 SHA-1: 875f7c09daa0f715f79b03b233fb53796e0fc5e6 SHA-256: 0fedce852a97df9c2c2ab302763823bc37d245bbb2c76c1279e7de96a25f5832
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of numerous URLs, many associated with compromised CMS uploads or disposable hosting, strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=hifont+apk+download PDF link annotation
    • http://stickerbarcode.com/file_media/file_image/file/larudubipemubuxut.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9c8084d99---nusamokaz.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/xasavokinevuwetivor.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16137b845c0f87---87740895399.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/wuwitamepu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea7a67de5---poxexiti.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zifudevavakukutuven.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/60709164072.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/79388223409.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/26004005159.pdfIn PDF document text
    • http://lulanjina.net/upload/files/59025608421.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/78976164557.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/3702741473.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/lewijikimesok.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/56203361480.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/55337016630.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/55067065458.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/61062472554.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/figivigofog.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/27802605245.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/96079692530.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401b8022fa4---50240074460.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/7068502793.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa89921c4a---17667653088.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/gulomobidepedojafutikogap.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/nuvufazepukugatupe.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_off0000d4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 10260 bytes
SHA-256: b5cdeccd595817d44a9775899cee25dfd276716849f5374250aa4ef71c1f0e52
font_02_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 17868 bytes
SHA-256: f3785a88aeb34dd2ca8e674a80f2b38aefbfa9abe06f651cdd9409ecf9372fe7