Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0d2b7ce3757980b…

MALICIOUS

PDF

77.4 KB Created: 2021-07-29 11:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e94532ad843b5ad4f66e0d214c2ceb5d SHA-1: 58aafff3409b4adc6787132480a548eb9053548a SHA-256: d0d2b7ce3757980b575e908c7da8033535e946a303d9413abe1083cb817b47e0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely serve to redirect users to malicious content or phishing pages, a common tactic for distributing malware or stealing credentials. The presence of multiple compromised hosts and the nature of the links suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/vufawodatev.pdf In PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/2b9b621dc92c88379f81df1c8f53483c/93298527062.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db83fdc578b---90999200533.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd26b04974---64618485112.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/15392057436.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a6cf7ac25fe675860e1dfbc2b0345c3b/58711007731.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/199510643.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b766fa465e6---95641948470.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/58900629476.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/98004684050.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161007fa128ae3---xusizoma.pdfIn PDF document text
    • http://annabarons.lv/files/files/vuzufakeve.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5f41edb560c82cdc03d2ecf89ff42b8d/44889192317.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/28372896864.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11596673517.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7cdc1b85---rozoruwur.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb94ec9119---wugigebubeporuguxuko.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f051be0fd84---xesagirufiburugejowig.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcd4893cb0---sazatilanigeb.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d547a25e67b578e06a20c4ef8b0b779c/datisidafivedigowexorebe.pdfIn PDF document text
    • http://axwelindia.com/uploads/penegesegopima.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe33f4a6b7---50010836936.pdfIn PDF document text
    • https://orrizon.ru/images/file/58317102637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ecuaciones+diferenciales+lineales+de+segundo+orden+no+homogeneas+ejercicios+resueltosPDF link annotation
    • 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_off0000ca15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA15 16028 bytes
SHA-256: 682fa3d098e3768b3aab70adf5cd261238a2b401722b33133116b74dca76d45a
font_01_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 11136 bytes
SHA-256: 7d4778e9cd478fa064117df24976035a6ae77996de4c0c700b535659792d7819
font_02_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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