Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ea31211df9a649…

MALICIOUS

PDF

88.9 KB Created: 2021-08-18 18:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d96bb1ece562812f6a35b4954fa95937 SHA-1: 519648cb98a5dce9d0d4b583fd62a966020eca9a SHA-256: e8ea31211df9a64998278f656bcee214aaf5da5506778e61d26289b6421ca8d3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external resources, many of which are hosted on domains associated with compromised CMS uploads or disposable hosting. This pattern is typical of phishing or malware distribution campaigns, where the PDF serves as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5001868fc---69542628483.pdf In PDF document text
    • https://b2cexpressdemo.com/userfiles/file/98438395249.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3fbf9bd000e32950b820f3b87a135ff9/1738476247.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/30837146424.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2h5gr8bh0ttd3l2ip1qqsf4vql/72651914568.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/79657486431.pdfIn PDF document text
    • https://wrd13.com/force/file/ripije.pdfIn PDF document text
    • https://scalping.ir/data/files/file/83080167575.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/em2g0fvdsm424liceikq3nc1a5/99739064197.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1f1b10c753396474a62ef17124bb1970/xuzenedirimerufaroz.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16089726b8a397---rakefo.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/6284056563.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/94225966720.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/guruninafoke.pdfIn PDF document text
    • https://activepymes.com/pub/file/96905697781.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/gezejaze.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/v4d1mgtave3liur66b5tk2t0s6/fitaluwonezalifot.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/wogewufutejafi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609abb968d9bc---junezeranafagulovazevave.pdfIn PDF document text
    • http://p-energo.ru/content/file/velomepokevamazavij.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/wubep.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/jujulaxufekelifovi.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/43301471665.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/beluzam.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/8c61c35c83b6b43856cdaf12b449d32d/10892428330.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aabb8a1d78---81717857188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=la+ortiga+y+sus+propiedades+medicinalesPDF 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_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 11028 bytes
SHA-256: 87ea56b8ddf6a5c9140626ac63ba8b1776aae3ec6fdc3459b187417f2428579c
font_01_sfnt_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 18616 bytes
SHA-256: 3fbd558cc7728825b3682e0b5313f3efa6879fa84da1c0aa55a0cf5aa1feae19