Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3eb004f1dbd1952…

MALICIOUS

PDF

94.6 KB Created: 2021-07-23 07:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: baa6cf42022f16428b2f497b18624142 SHA-1: 28e453689d5ff7f231e0d5468ad0c977ea3e7289 SHA-256: a3eb004f1dbd1952d3732ddc622f4a496594db01f98718e702b53dd7deb74eb2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. ClamAV detection and ML classification strongly indicate malicious intent. The file's structure and link farm behavior align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad1a8880d8.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/942e18d33f8ffa58564ca723b252d238/tomidufezumaz.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/eqikgk49us555i455lr79n9v5q/jugurokemagonedalezujipet.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/fikenogevinoguzaxunalukor.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/47025851514.pdfIn PDF document text
    • https://hgb.se/filer/file/39628333921.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/230b35c318429aecf83e3ff80d8a67d9/nomurufigexatuwiwetewike.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2cc8f40a5f24fa213ae44346730926ad/jetuduzano.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6854b9bcd---2828649036.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/kjh31m6j5k0jmolr0rmffqtt08/69592821448.pdfIn PDF document text
    • https://nada70.org/userfiles/file/nigixupewifubizat.pdfIn PDF document text
    • http://citra.cl/userfiles/file/zerixugavuralugi.pdfIn PDF document text
    • http://learningkey.org/userfiles/2368878953.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b5fd5edb---52041747146.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/67101312154.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e0193f23516---mivekeboletos.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c528e61b5a3---81821335709.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/tagoriwigetos.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d450e95b7086942b0e7f47600c275534/fulavukutixogegozu.pdfIn PDF document text
    • https://saam.vn/images/content/file/11215997900.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/28126158979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=do+strawberries+do+well+in+potsPDF 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_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 10612 bytes
SHA-256: 02b471b12db58c467233533539543a1c2a75b1113c3afd386f7dcad3a9e39220
font_01_sfnt_off0001273d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4F 17348 bytes
SHA-256: 3e4482fb39472159bfba194b7ff2b85be27593a6bb9745dff5612d725f7f30d6

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