Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d83ebdbfdd2cd3…

MALICIOUS

PDF

70.3 KB Created: 2021-09-07 22:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85c5a5f5a8e210de134c92a07f831a7c SHA-1: bdb78f54c3a4f850734a5b09e1004a3fe7861aaa SHA-256: 87d83ebdbfdd2cd38818352a3e6fa3d40649fe59da5ca2d97e0c3664b5556cbc
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised CMS uploads and disposable hosting. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://astorandblack.net/emailer/userfiles/file/rufoduratawavapujibidafo.pdf In PDF document text
    • https://eyetracking.pl/userfiles/file/33564378600.pdfIn PDF document text
    • http://myredm.ru/uploads/file/59156132057.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/lovoveruxovujud.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/8455984332.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/a1h0n157cggmvm4ilbghmtof09/wolotekorumex.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608460b6088cc---13748019025.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/bogorewikumetoxikagan.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/3c09178c62814a336293df61e771b29a/lidamexikofamedix.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/70663982033.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/8go85scaabtanseibcl969hjnu/pakabumorobokurigofawuka.pdfIn PDF document text
    • https://parfumzone.ro/files/file/9109118937.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/85144024.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef2b70060d---popapademefat.pdfIn PDF document text
    • https://hongmao.tw/uploads//files/202108101216146789.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d7848e11ce397a4d113fc8aba6fa5fe7/77046613559.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/vajumenenagamenud.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/dc1fcf97f6053f5477543ef8c04d2d65/wugetotixuz.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/59383425138.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/44164636719.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e955c23e96---xexedefegup.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/00d4455dc9c7d996aaa65db37a0a1b81/90089075406.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/29144557639.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/60597771768.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/26955737012.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/6940861417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=globalization+concept+map+pdfPDF 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_off0000b550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD62 14968 bytes
SHA-256: 94dba42d9dd859fd21fddd7563679a400fa8a2e7f675775b0ff8bacd771e2a1f
font_02_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 10752 bytes
SHA-256: acf89378eee6eab37c3badfcb73e5009f4c6f5d16d830f113b81462542398927