Malicious PDF — malware analysis report

Static analysis result for SHA-256 f874d1e30a7ec34b…

MALICIOUS

PDF

91.2 KB Created: 2021-07-07 03:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0145540a61226389d172e5e1572a159 SHA-1: f6b9491a080b09387e194b522e7b5e1b33fca669 SHA-256: f874d1e30a7ec34b5cb11c8d6a2b473f88111e2e09af5f96507762c4b86facdd
156 Risk Score

Malware Insights

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

The sample is a PDF document identified by ClamAV as a phishing trojan. Static analysis revealed numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness, supporting the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://pistant.ru/uplcv?utm_term=ac+to+nyc
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/46b6da2b7a187e9db9c81ccd3024a43d/femebefofe.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/k0k14qg1574cq7gm1nht3k8nfs/wovorogelapurisegemel.pdf
    • http://scarpatti.com/files/maboxu.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c173c9dda1f---gofanet.pdf
    • http://barudan.hk/UploadFile/file/20210626110201610.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6c74110fb---vatixinex.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b72b87afa41b32caf3790310c4b75b79/sifirin.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/tuvofewufet.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c9534cad0---83770003912.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4dea82ae7---34985685518.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/6vm03ha8ls1raig9lhd51vu6vd/85551408563.pdf
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/jipebevodo.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c1f795ce62a2f39d2b35c2dcc6c29653/51298721085.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b49425144a1---moxawubosifupuputepixipup.pdf
    • http://www.asslar.de/downloads/xidofozifexum.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/80542706006.pdf
    • http://mini-garden.ru/userfiles/file/kewurapuxunesik.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7139d200---35125039830.pdf
    • http://angelescare.com/userfiles/file/jixup.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/davajaruwuvaxaviz.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7fh7csqo1vn59vtcc6vp6g0d2j/vixuj.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/ae10857e93551c86ddf6043347c4481a/vajirozegamivigemisumab.pdf
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/83873984831.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3593340db6---47272094545.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d751d65c7e6---gigejikiwuluzut.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_off0001040b.bin
2f709881d5af78c025024c2a9f51a76aa75ecde01a895504627add46c3fcd7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 9620 bytes
font_01_sfnt_off0001190e.bin
b4bbe0fbaee7cab3b0ea22bf6da630d5ddf9d1470f0596fece415780f304268e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1190E 18080 bytes
font_02_sfnt_off00014805.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14805 16792 bytes

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