Malicious PDF — malware analysis report

Static analysis result for SHA-256 8846b3d505ff2bbe…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 08:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4fc9b24198593937a71fc15eb58c417d SHA-1: 6aa3861920242a5b9ff87582ce61874a4b8db331 SHA-256: 8846b3d505ff2bbec557ffc1c61e82081c4b53e48e7b1d4b9a9b769135528347
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=tao+te+ching+online+pdf PDF link annotation
    • http://africalegal.nl/userfiles/file/66832490143.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/78366192360.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/81e45379be3441031bf64cae53b1a576/68026680985.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613187d0407e0---nafipurokofugenit.pdfIn PDF document text
    • https://ijestr.com/ckfinder/userfiles/files/41675878209.pdfIn PDF document text
    • http://mextro.de/upload/files/ranemoxutunow.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/81145718514.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/31984961640.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f95ba611a---dexitofewu.pdfIn PDF document text
    • http://ahknchem.com/upload/files/takuretifiripuri.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/32289795092.pdfIn PDF document text
    • http://cke.hk/userfiles/70924875228.pdfIn PDF document text
    • https://equalland.com/uploads/File/fisusujijupozezofivawug.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/memavufujofa.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/jipoxava.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/71eor6i3gb8ckkr21511t98d2n/81185140343.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/sotetajurufadawosezavas.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/86a175cbd7ddd96e6c86e41ba53e42c8.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/70730d4a776c674128507b63078c169c/nagexefagobowugejara.pdfIn PDF document text
    • http://home-plast.ru/foto/files/88259286235.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147baecdae36---69198320597.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136ccfd1cd64---62654818955.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b7ff20d10---togumaguxita.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_off0000b294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB294 14976 bytes
SHA-256: f371c70beea506fbfe8ae802aae272453200ee9b6accd0fa8ea60801aba07f82
font_01_sfnt_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 10596 bytes
SHA-256: ac5b0414a1f5a2456ab6bdca28021829720f63ac3db333d19bc397dcb2af19ca
font_02_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1