Malicious PDF — malware analysis report

Static analysis result for SHA-256 b482a8f206c5788d…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 18:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e7ec6a80eb06a8996bc121e0bf5a232 SHA-1: bebdcb3bb1a2420c6948a13ecfd1831631f5a32b SHA-256: b482a8f206c5788d40480682cfb0fd04b7f44b034fc24f2f3c8148479117a7e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://mabuksusu2.com/contents/files/gaxirapojoxuvutokutozorim.pdf
    • https://khogiaydantuonghanquoc.com/images/news/file/rajir.pdf
    • http://ipllaser.in/uploads/10222665843.pdf
    • http://anitacalderon.com/ckfinder/userfiles/files/17744523224.pdf
    • http://sirinthepgroup.com/userfiles/file/sixifotagex.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa64236925---62540850428.pdf
    • https://profm.hu/files/file/futorotatelus.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436839a251a---91311404388.pdf
    • http://fuguchair.com/upfolder/e/files/20210926170013.pdf
    • http://hanahana.vn/media/ftp/file/vutezanajuru.pdf
    • http://museodegliarazzimarsala.com/userfiles/files/39316453086.pdf
    • https://chezgregoire.fr/userfiles/gonukewejiwiwi.pdf
    • http://dunakeszi.varosom.hu/userfiles/files/46875627750.pdf
    • https://tyeetomsfishing.com/userfiles/file/fobujabopufuve.pdf
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/tatinirujumipekamiguzadi.pdf
    • https://wendi101.com/userfiles/file/67900272872.pdf
    • http://hawaiisushi.iorderfoods.com/uploads/files/63656300966.pdf
    • http://tolltisztitas.eu/userfiles/files/muzemujagosefu.pdf
    • http://ajarnveerapong.com/UserFiles/file/mufaxebufodirafetexan.pdf
    • http://onroerendgoedindex.nl/images/uploads/73667873652.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143193362a1e---xasogejebimiwezofewav.pdf
    • http://speckrepeg.by/UserFiles/files/12268092160.pdf
    • http://ambvet-trefontane.eu/userfiles/files/vevefujetadolixezupaz.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1ad51e079---sadalezoxetijufizufitevo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=uninstall+dropbox+android
    • 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_off0000afa1.bin
ff72ea7667a3f27595006fb50ec21c3ec33ba6de407ea9700db60d58952ffd52
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA1 14784 bytes
font_01_sfnt_off0000d4ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 16792 bytes
font_02_sfnt_off0000ecc3.bin
b7de83377e1c41457fff4881d7f72cb5b4495153816094a5e2c082390a65e901
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 10500 bytes