Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2ef5b7ded9ec0a…

MALICIOUS

PDF

83.7 KB Created: 2021-08-16 20:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad71a2602c2ada30089d965ebd601397 SHA-1: 0fe06f8ed05290a2396b332964d3e8e8e699a9f2 SHA-256: cd2ef5b7ded9ec0ac95b7c19a0381d33eddf5c8e64bc7f205adc464b0f8432ce
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs and points to compromised CMS upload storage, suggesting an attempt to lure users to malicious websites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further indicating a non-standard, likely malicious, purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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=easeus+data+recovery+wizard+trial+serial+key+free PDF link annotation
    • http://pune-india.info/userfiles/file/nozarilabisomogoreporaji.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062514360435.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/5787263180.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/zitoguroxidawubulakalif.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/64399249833.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a23948292---491790089.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/tugafubusuxadajoxofe.pdfIn PDF document text
    • https://unosms.us/userfiles/file/98673382000.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7c465855bcda1d0340959a0717ae567a/lefev.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/16626048941.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/18737941718.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da67138efcc---27047591897.pdfIn PDF document text
    • http://skomi.ru/img/files/file/femipo.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/20860484131.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d012e115d98---38367177908.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7bc46be00---33284438043.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/48695796632.pdfIn PDF document text
    • https://netlandschool.cl/files/buxedinuvedoribejuma.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/59edf9182332bf416f3bb147aeafdf5c/niwitupugenelag.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7639c575f808bb10bf2bae9fdeffd02c/96039374098.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/11557748348.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/sezamafulogirixulifune.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/welokeraroluba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9eb9e05dc2---46574278465.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/67999165355.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b41f736659588eb1ef851f280ba23aa6/92696546971.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700caaaf431---52291301624.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/d984qqs84d84a48ajcn5ao27j6/panosapixazuvevavekeka.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_off0000e3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 16456 bytes
SHA-256: c68ee03441dd1274fb891e7058a73cc4a7751871063c72f423d60c8df29fd1ed
font_02_sfnt_off00012690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12690 10868 bytes
SHA-256: 9697e0bfcfc3cbbf45e0ace346182a81099460db4c1b23024393bf862dcac8e8

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