Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4ece33f7cf0670…

MALICIOUS

PDF

73.7 KB Created: 2021-09-26 08:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5039be0bb2b6cefd0a19225e3d597e1 SHA-1: 60e2321858b046bbc8df613452e38929723a6f97 SHA-256: 5b4ece33f7cf067086ebc03d8bdd665f52ff3197288efd62930844e70aa7f6dd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=whatsapp+para+android+uptodown
    • https://www.ewdel.cz/ckfinder/userfiles/files/55512551096.pdf
    • https://osikovo.eu/webroot/img/content/files/13142088030.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404067ec8a2---gofigozepizikixa.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/nimemerironivilerasiwem.pdf
    • http://hcvitamin.com/webroot/img/files/68787232815.pdf
    • http://clinicaveterinariacene.com/userfiles/files/xalirosabipuviliwex.pdf
    • https://nexapos.com/upload/files/sasufuwewuvugifixalogu.pdf
    • http://tecresconsolidamentorestauro.it/fck_data/file/suzifatibe.pdf
    • https://akilanews.com/ckfinder/userfiles/files/42949273358.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e5ce52d14---32155879435.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c8d09eff52f37ae0eefe7cdedfb5c6c2/zeverimanedel.pdf
    • http://srtprogetti.eu/userfiles/files/falogajogikoxubufidoguto.pdf
    • https://ppkh.net/userfiles/file/deraguwubezenefogasujip.pdf
    • http://lindendirect.com/ckfinder/userfiles/files/tizile.pdf
    • http://teamtrinity.net/trinitya/file/83030048646.pdf
    • http://e-motyle.natura2000.pl/imgturysta/files/wufuduzagawotebifat.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614d098013cee---48677781765.pdf
    • http://grabnerestriche.at/jusekik.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79813540171.pdf
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/xovavagowe.pdf
    • http://starma.pl/files/file/rupebola.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/zudakejewezituxatu.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_off0000b6cd.bin
defe71871d4c6c3a8bf274d26b753aec1e49489b22a3f3b4dd64f3260f10f7d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CD 10488 bytes
font_01_sfnt_off0000ce99.bin
f275141c7592e97cd42619e5729b301e96824576602e5cae4290cdd2e9e22ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE99 19800 bytes
font_02_sfnt_off000101a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 16792 bytes

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