Malicious PDF — malware analysis report

Static analysis result for SHA-256 da08337600f0b318…

MALICIOUS

PDF

139.5 KB Created: 2021-07-02 00:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c0a3b4479a819e4f1226fd257ee1d12e SHA-1: 6e85a7b72041571c7c52fc137cd2b7e47036611e SHA-256: da08337600f0b3186258ae64feef178ff1c114dad780533775be6010db5443f7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised or disposable domains, which are likely used to host phishing pages or distribute further malware. The presence of these links suggests an attempt to lure users to malicious sites, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://anhuizhkj.com/upload_fck/file/2021-5-2/20210502020547579542.pdf In PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f809ee2a67eb0cb9a2a7ee3697a1451f/jerobuvazigu.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/fukibuwofogota.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d7efb20d2c6f2130ddcc189dcf02f3dc/90501413515.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/31217409838.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/54714452271.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/75ae34863e4bf195598069fed5575bfa/29936481780.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3f624aeec---39524849212.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/e93c8bc8a02bdac1b7cabc262ca2da3c/16269920561.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160706f60e94e2---97380244665.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/b9mtne8item7cg5kliqt481sl6/jugagukavupekaxezemivi.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/bedae3f38268bb981d0acc3ddd5f72df/xekelipul.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767feccb096---fuxopuwunilurutagom.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/xoxilafibotupojosi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4f8b73102---55405652690.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d29332628f29265f321437a6acfcdde1/zazudosedebuwitujup.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b16661c9---xedofixetuwup.pdfIn PDF document text
    • https://bselink.com/userfiles/file/wijebesunafe.pdfIn PDF document text
    • https://digireg.cz/upload/pexegiwugobif.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/c7f69933b045963ec814b49bc4b6ba30/63150136604.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/72hjaipiogskfdqqhes2t86rs8/dowep.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a035032f---nerorapenasuw.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/91244200010.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/vimokimawiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+old+do+red+eared+sliders+have+to+be+to+matePDF 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_off0001bf58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D76F 10692 bytes
SHA-256: 2af555f5ce5aaee296d117913f33219bcfb87dfac16a9860429564992e3f3a8b
font_02_sfnt_off0001efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFEF 18172 bytes
SHA-256: a83b911b9cf37c27d24c7584125726a07decb5fdb8ac8c02fd03af8d55092d09

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