Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc764762f27be3a…

MALICIOUS

PDF

102.2 KB Created: 2021-09-06 23:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac1d74884f2e96c9b35462c168994f97 SHA-1: 4dce8262b461e88f16949d5a1d15ee433d8c0ba3 SHA-256: 4fc764762f27be3abf09be5545aa52d6588af0e1452cbcd976f9a6610e572c99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094adc37780a---66489068902.pdf In PDF document text
    • http://a-xian-coat.com/uploads//files/202108102356518613.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609af82e698ae---xetefuruzuzi.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/fokajegikopoxedetivas.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/xedazanoxulelopavip.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2e7b82aabfa1e5ce04c7f591f12d3a34/dasoxoderobiwa.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de876cb5fb---baxosaroribe.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/rolozitateguvu.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/kedotusijidemog.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/jupubeg.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/40530883738.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d23009331---sefowitugovegetef.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210715164449.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/14366995296.pdfIn PDF document text
    • http://sbkf.org/files/files/kutorosikex.pdfIn PDF document text
    • http://snsi.jp/image/news_file/lotazafifu.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/15869924802.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/faa30e9510e3307d94e24d583b2a90b2/pelimewarugunegawegawa.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160774bab585fa---mozuwurelotolamaja.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5a6e695e4c68589f116e8f51c6044f6f/dudiwibokapudupe.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/fizuxeloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=counter+terrorism+act+sri+lanka+sinhala+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0e271ea0687afd7c4cbae2a88a76e0b6/dukufeteniz.pdfIn PDF document text
    • 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_off00012846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14058 18732 bytes
SHA-256: d13ea7742c613d92da066c87bc2a99378df50d52e44f94d6a7a1ea11eeba6d85
font_02_sfnt_off00017119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17119 11108 bytes
SHA-256: e6b974fd90a24ba9fe5cb186db3de29678228f11d57d14db72984be10742f027

Open this report in the interactive analyzer, or submit your own file for analysis.