Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea553bebfca85f95…

MALICIOUS

PDF

132.8 KB Created: 2021-07-04 06:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9eed9738ae5fac5d7fde0343f5b90b1c SHA-1: 19f93d279ae13fa5799eeb0b3184a044e90c3278 SHA-256: ea553bebfca85f95e69099e125c213f0584ce703fb5eb37030771cacccc9ab57
124 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised WordPress sites. These links are likely intended to obscure the final malicious destination and evade detection, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3952

Heuristics 5

  • 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
  • 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.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160939ebd28592---75193417245.pdf In PDF document text
    • http://baohanhranghm.com/upload/img/files/25723646028.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/159nrmn93ot3j2dkq15jro4c9m/55677384240.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/o4edo019542ic0ukct0pc52g2l/xijituze.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfefc76c891---wapewipa.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/mururebamud.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/7546562736.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u5rs1ev7rrtrt06cheq9rb8uq3/wobeduxironarosugavu.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/9524bd3fd5b5726b6b540fdd62442fc6/numixuxipowugamewuwa.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d25284982ca---tiluxibozizosezopubasiter.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e83d67d3e1---52237239639.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f0e7326b891cf70442cf28a2e936cf00/61529500553.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ac72a6e7d9a5558af574298dc2996477/92349904840.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aa2b29c49.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/fd4abeaf6144d74fd363b3fc128bbe22/gexosozunala.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2d227b18---93730237290.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/sogujiwonuv.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160893a2eaa94b---nazawuzaledud.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/sdpc5sg64k1lav5dpl2ij7ssac/fuvoza.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/fapivudalerodusi.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dbe7cdf0d---58423434564.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/82759023056.pdfIn PDF document text
    • https://la-klamm.org/Files/files/82627545954.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/8qon6mqn4everasuht298r07v5/29414322316.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/7142174182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+handsomest+drowned+man+in+the+world+storyPDF link annotation
    • 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_off0001b94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B94B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D15D 17928 bytes
SHA-256: 69dde6d6c8235d2c7fd1dc70c1aaf5acbdc65ec34b7be3f0a7ba93a62cdcd286
font_02_sfnt_off0001ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFDB 10676 bytes
SHA-256: 0ef8de5dc590d4c9d3c23ffd4e13f51a5dad5200f2f03e1b30d7762081e02d3c

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