Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a9a509aa132748…

MALICIOUS

PDF

98.3 KB Created: 2021-07-24 20:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 787e7ea8ebb45b0ac02acda178a26144 SHA-1: 50b61a5f47ad43bec899f738cace246167c495a3 SHA-256: a1a9a509aa1327480c90e84a5ac872ec65d896058b35d0a70aa42bb0985caccd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d66e9bad197---65984306339.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/xigafukav.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f134805bd7---26050738231.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/70197493802.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b66e296b5---jerujamudopasekuladeleb.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/42244906236.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160726a7c6512f---zanukewira.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/zoravuwekodilopul.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/31072919416.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/53c96a7a291e8104be9f7c7972bcdabf/73276298735.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/jobubipi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b27eeb5d9b---97109006968.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/nulobugapegajenufaxitenor.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210720_522AF9EA508CF9D4.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/93d4875351069f7050c106d834fc484c/20950597246.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/8809535360.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/52835699271.pdfIn PDF document text
    • http://babamoleskine.com/files/file/22131635628.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93975c0679---68968017392.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ab16c9487---75879168673.pdfIn PDF document text
    • https://abeess.com/userfiles/file/perugiduwafapopolovukewo.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/sivemuru.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/48mf9hjqehf2s9ahrs7a37u7d4/darogure.pdfIn PDF document text
    • http://skupka23.ru/upload/m/7839880390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pie+chart+worksheets+7th+gradePDF 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_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000131a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A8 10728 bytes
SHA-256: 09fb3770f20063319f70f50d5ab9dacabd57ecc2ad4dc06e9a2d5c4500477813
font_02_sfnt_off00014a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6D 18068 bytes
SHA-256: 9ebad278342b2ad387618eb06779e0a56dcbf41d6681291d0354c9bce86d514a

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