Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b44fdfc970d72e…

MALICIOUS

PDF

173.5 KB Created: 2021-06-27 03:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a5dfa1bdedf5dea3a7ad670d04a3b82 SHA-1: 29e50fb67a3d881b6e6eb599c20e3c78c5948070 SHA-256: c6b44fdfc970d72e75648fb28161de3e96ea7911b9f37139751818e4640e020a
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads and disposable domains. The presence of these malicious links suggests an attempt to direct users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9679

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/5sc2pe1n4atic3iqnpk36ivdi7/81040081813.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d5877bf8---nadajenuxisaxepebixutamek.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e2e706ed03194ca30a2b74a849ee5b40/57219191084.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ff67999e92---gutopuwesuj.pdf
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/68538839472.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fnc8lemng3si64f3palg9lkvpl/kowaki.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/oalm4d31dpoiik724f5h04t19g/lavazolagugalotefejun.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/rivafakuxetodifevalow.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/41033206370.pdf
    • http://cjatkinson.com/userimages/dobevajinuki.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d718b0d2e051571cef5056c98a278978/1622972045.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7b260140---66193868517.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5c2405cc5f2b6306ee0b404bf622a9f5/pufetim.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e937dd13da---58640339621.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35126a992c---veborujewepo.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cfd7e3594---28996037434.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/lqs90ruf43o08a98a1t6b3mfah/metotafik.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/8o1iefv3r6md01fjq90tq40as3/zizok.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/u638rnktu0jah242i8cihhjon5/zedal.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rclvkjjjn54lb2h5vm6eguhi54/45887134700.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e5cb6206---14650132109.pdf
    • https://chp-travel.ir/data/file/13577224245.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3dfec967b---83504631513.pdf
    • http://rollfactorytogo.com/uploads/files/96647672420.pdf
    • https://alternativecarrepair.com/userfiles/file/29807261870.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=no+weapon+formed+against+me+meaning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022269.bin
2c77e5120e2272f8187769380deaf58e2fbe0476337b316dcf601e5c42df8b9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22269 10856 bytes
font_01_sfnt_off00023b52.bin
c81023a1493b94c7b4d4cb9b781614535a42a3d7bf31bedde5270c0e24a2eaba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23B52 19140 bytes
font_02_sfnt_off00025b9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25B9D 16792 bytes
font_03_sfnt_off000273af.bin
c6c8f4f2136486daf1104f553ef218e23a2f8854da2e5a827e5cce6cbd675921		 pdf-font-stream PDF embedded font (sfnt) at offset 0x273AF 20880 bytes

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