Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca12476c9983cec7…

MALICIOUS

PDF

85.9 KB Created: 2021-09-08 09:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abb21ad17b02f125cfd14c4976e4ce9e SHA-1: 9b95246e6a9ad987706ac79813c0960932579347 SHA-256: ca12476c9983cec7451e7cbaafdccf3970ccda6d26e9131506172c6b6f313721
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The primary attack pattern involves luring users to potentially malicious sites through a deceptive document, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pokemom2.com/uploads/files/bejedexe.pdf In PDF document text
    • http://halmar.info/userfiles/file/xuwuvurugatedelu.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/46291735888.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c32495160a---75577877012.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/57380370322.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/2b8339a42f253fcc1bbeb2f67ae8966a/denupagejamifarutugim.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa72d975d7---15985566288.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a21fb646471---xoxamejunow.pdfIn PDF document text
    • https://egca.fr/userfiles/file/sobejemabevapoxavikigab.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/xejanamixuvuven.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/ginapuxegimegeger.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d373d3539e---91653921413.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a046ea4b4b3---dikenev.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/80461264101.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/berixubemilibigof.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/72949833799.pdfIn PDF document text
    • https://ksuskalology.com/images/file/57152141540.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/kumenirosizumebob.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/q1q5fc7kk9nc44aqiu5ju1b97m/tologuwu.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/sasan.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb9d189cfb---paravekebawix.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/xafipebimixigotona.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/viriwujejujibajixi.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2001163e4---37383065876.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8cbb219d5cbd6f3053efc5cf5148358c/74521677195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=msci+world+momentum+index+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb3eb71af---xejamuxarulev.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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 10900 bytes
SHA-256: 10577c128f6385e441a378a11628ee2d2e2098ed2e730e6f60cc5d4ae570772a
font_01_sfnt_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB4 22884 bytes
SHA-256: 5509083d23fa9001607de668fabc87ea121e7d79d8f20082c34085c3ba864473

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