Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadd134d1fa2c23b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 02:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: addc302ace21605f464c3e559e8a18bf SHA-1: c5cf0998ec688b01b8743796d8b024ec7d353113 SHA-256: aadd134d1fa2c23be2c6b11dd5d06563b74d844e5144db075a5c1d7559e49c5c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple unknown PDF files as targets suggests a multi-stage attack or a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://iweldbot.com/ckfinder/pho/files/85992254664.pdf In PDF document text
    • http://nuovojob.com/userfiles/files/33552621781.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325514a2809---24594343705.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/50122134972.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/95656249360.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/65355109044.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/28717567635.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210907014426.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/dezedisegami.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/70313164244.pdfIn PDF document text
    • http://chinalabware.es/d/files/zusipet.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/budatigigof.pdfIn PDF document text
    • http://mdtrend.hu/files/file/nokezuxefepuvarasoxojenal.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/fivomedik.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/xerevorefifimexikojixima.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/dodolerepiv.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/fofagunepoga.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/gudanefifexosivoletuzu.pdfIn PDF document text
    • https://777mto.info/contents/files/9160147647.pdfIn PDF document text
    • http://kasand.com/userfiles/21309563492.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6c02b5067be5595ff974a37118facfc0/95176676533.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/edc404fc8d77b8d4422a3689dc211cc8/fejosulanuwenavawutasofe.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/30087582648.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb5f04f24---febewotowalojoxudifajale.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/purusejisotex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=billie+eilish+sexyPDF 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_off0000e581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 17848 bytes
SHA-256: a43a97064e6dc5d6ed7886755386d2ea9f0433f7681ff0a1754f0c08875d15a9
font_01_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 9892 bytes
SHA-256: ac6507299985c9b7028a5d94808016c062b5264c038a357e09c59cd040a4c3d5
font_02_sfnt_off00012a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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