Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36ab8be73ac21ee…

MALICIOUS

PDF

109.1 KB Created: 2021-09-02 21:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1569be0afcfac85339477f3c4a4a33d3 SHA-1: 5239bca60acc91bfa1c5765902c70a824151263b SHA-256: f36ab8be73ac21ee75ba7b79060a699029b1843cb867c46c6d6df03ac90faad3
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. Heuristics reveal it functions as a link farm, directing users to multiple compromised domains and disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the PDF structure suggest an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://pistant.ru/uplcv?utm_term=feminismo+radical+y+genocidio+mundial+pdf PDF link annotation
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5631283c3---zevutedev.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/wiludonisawujad.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/keboxiruwitinopefip.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/gerujinexar.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/vavonimigukafaj.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/98776227983.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090202200798.pdfIn PDF document text
    • https://baongochoa.com/upload/file/63849301077.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b36215bcde75c01e380a24fa8d3ed395/kexeterefujopujufor.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5a4008ee8ec713b454fa52b0e35e22f6/zebonabulimuvatatenuvoxa.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c5965ae70ba---nuxakoduj.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1uk9in1gb1urgn2la3nd0k098v/kiletefixaro.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/misiliseram.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e4632573f---xuverolaxomulodexif.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/h88brvrtft2n4macs638rgpbo8/wijepodofimadasowaxizes.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca95c59a1---73158825035.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/b6efngslnkrob9trgo6m8uq3jn/lexoxowisabosalet.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/cre2glq546drgqm6k6qgmagjs1/dawefawovavunemito.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/62929001214.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb70ec91d5---meluvugopapasiju.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607522ef9b8e9---tijizabujumetone.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/rijefefedafedegilugupixe.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/31668166048.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/tofukunigotesifiwukor.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202108260506599020.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d814f88da4c0047a1a7bd684b66252bb/nigizafebukawunoz.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_off00014027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14027 20064 bytes
SHA-256: f791f7405c3ddfe7ad278fe1555b5d06ee2dfbe73788dfb5d537030828ccc592
font_01_sfnt_off00017452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17452 11056 bytes
SHA-256: 7c33ff7371a763d4f32e65040a9fc6e06c13f14c630c6f3744a1522329ccfe8b
font_02_sfnt_off00018dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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