Malicious PDF — malware analysis report

Static analysis result for SHA-256 58fe56dc9e5f1afa…

MALICIOUS

PDF

88.9 KB Created: 2021-06-30 00:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b09aadc2ec8c096788a4e3fe20bd1b5d SHA-1: 5838a0e3b529e9a47d3143f30a919580a2417067 SHA-256: 58fe56dc9e5f1afa334d8a72e6696ed52e67a2adc6c137aa1b9dc9e66379b75e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. ClamAV detection and ML classification further support its malicious nature. The presence of multiple compromised CMS upload links suggests a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 https://irlanc.ru/uplcv?utm_term=how+long+does+a+minecraft+tree+take+to+grow PDF link annotation
    • https://samowar.ch/upload/file/xozumiborofuguvipemiganup.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/3c32fc867530539b8fe08ee24d5ba1fb/8421502086.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/3aipic43j7cmtousp0ebo3j9u4/sixofizuraxal.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6b989331e40810ef2094bdd3555a1cc5/ruforawo.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-29/images/files/diwutefarugagenuvita.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fe6f77b17---korawamipitajukatuv.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/89222363384.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/4e55ffbe761b2ce5d78ca0306cdce1bf/munijafu.pdfIn PDF document text
    • http://pass-eco-energies.com/ckfinder/userfiles/files/zinidir.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/fa5f9e996113b2a102f2743877d9e598/rejogilofelusisi.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/412d6a3e9460a025ecbba1e2bc56cd07/89562746496.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/bajemukofenub.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f48d9cd3fa5c8f1e951265c79ec4c6b4/48963516523.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/zudibaxekagizirevemem.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/dubakig.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070ef032cdc0---lotosutegonofogijixapufa.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ef44824fe---lodoxakavepov.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8acfc3ba79---govaleruxi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1069240bbf---47659431620.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/75477784736.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/tozikogaseruwus.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6172ad1d7---medatabuvujumosabolum.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 17012 bytes
SHA-256: 8df044cb83d3d9d25733cff6c8e28de470fc45b38ccd89a7387112fd5efd86c4
font_01_sfnt_off00010cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB8 10988 bytes
SHA-256: b0822f15a06df1a87ea7b5ad2881bc73cf6546c379c3be9fdbb3707bc66d2921
font_02_sfnt_off0001260d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1E 16624 bytes
SHA-256: d324e5be53b50eb955aafcc2342ff6c165202448d0efe070695b2184642ad78d

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