Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabc6adc0487025f…

MALICIOUS

PDF

69.2 KB Created: 2021-09-18 05:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6c3febda65a2b81b580f2772fcfc484 SHA-1: a47da7ac914fc11aa7ad7caffa8549eaa0302ca4 SHA-256: aabc6adc0487025f034ab9af9ff34c04b59f0448b9eb62559e80f8b8ed3e52df
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and a machine learning classifier. It employs a common phishing lure by presenting as an image-only document, encouraging users to click through to external URLs. The embedded JavaScript stream and the numerous links to compromised CMS upload storage and disposable hosting indicate an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=how+many+calories+are+in+a+snack+size+oreo+mcflurry PDF link annotation
    • https://highlander-inn.com/assets/userfiles/files/44866963215.pdfIn PDF document text
    • http://weshare.vn/attachment/files/51152629810.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/rafizojivemeridixepetiki.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358e54d5b37---wunavoxodejuvabugutagol.pdfIn PDF document text
    • http://wohntraumgmbh.at/sebutewekijuzip.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613da050c3c34---kexufotemataxudareniveme.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/lopome.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_013603.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/pisoja.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/zebobopoxipiwewe.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/bumijaporixalebijalosemi.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/xovasoxoxorubuxuj.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/51086861760.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/semolobepazozuv.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/92932848954.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/makoxujusafebunoxesujiro.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/biwixixet.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/52826924783.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/fufuve.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb26eb2f49---34245762495.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/niromiwinesodekaja.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451f56be332---57269761448.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/rurikazokibosu.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/gopuf.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/28467399748.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_off0000b38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38C 13808 bytes
SHA-256: dbf4a9240f90c1bbfec5c7f92ec43906a09e9599ebe9b58646119b80387fa99f
font_01_sfnt_off0000d531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 10840 bytes
SHA-256: 1a5a1bd320283fdaac4385946d5473c6c4ccf4f52b7a8ab0db76254883b7cbc5

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