Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8ac4f4234dbf9c…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 01:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0ae32d14f0fc334f80a6754dd1b38a0 SHA-1: 4ca2de4a8ff60a6254e6bd5b76c9c8ca5ec6e611 SHA-256: aa8ac4f4234dbf9cafe6db3fc912bf4af9c5f24e27cc49358edd9a9afce592ec
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to conceal clickable links. The document embeds numerous URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 68 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.
  • 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://cructi.ru/uplcv?utm_term=dragon+city+mod+apk
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161523d34974f1---96542640872.pdf
    • http://fandimnarodaku.cz/upload/file/67472527332.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c793d2b6---xurozusinenutax.pdf
    • http://discus-rus.ru/upl/file/duzajikob.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/de698a44915cb8a483ee189b76e4ab10/datexep.pdf
    • https://dailyhondaotomientay.com/upload/files/luzuzajuwefazizofupi.pdf
    • http://tdjl.com/uploadfile/file///2021091416511143.pdf
    • https://xlquality.com/userfiles/file/bigiwa.pdf
    • http://www.rupankar.com/fckimages/file/winomifogulelojojiw.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0a081e1eabfbf43919b9ba9508345611/xolet.pdf
    • http://ccforum.kr/uploads/file/1631201531.pdf
    • http://geombiagioschettino.eu/userfiles/files/63584820989.pdf
    • http://infinijewelry.com/userfiles/file/vukamexum.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161395a2277441---61943889301.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/085095d047a3d46ccc3b01c7f4532c93/10150177414.pdf
    • http://soc-in.com/data/media/files/wupapowilukixalekak.pdf
    • https://termoformat.md/img/files/7392560087.pdf
    • http://ya-ke.cn/admin/upload/wuvuxizapejilulefovuxel.pdf
    • http://sofia-es.tokyo/yamituki-n/uploads/files/87519488579.pdf
    • http://zhouzhuanx.com/v15/Upload/file/202191893172814.pdf
    • http://cellesekorea.com/ckupload/files/kapixaketo.pdf
    • http://fese.in/ienupdimages/images/files/52285066821.pdf
    • https://soudurelausiere.com/upload/editor/file/89852153769.pdf
    • https://mbamantra.com/ci/userfiles/files/fopubilifida.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135583f9146e---davebutezejupefobuxup.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DF 16792 bytes
font_01_sfnt_off0000c9f6.bin
218904ed40c9336f4953f7efe1b0f910073bf547bd8d298da93df4470635e9da
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F6 10720 bytes
font_02_sfnt_off0000e258.bin
688aa66409b73af1aaa8c4017dd317068d3a02f2774a898be1dc08fea07eac11
pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 13992 bytes