Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b013346b0bbaff…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 10:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8def199eaa27d773d9364ba7e889dd8 SHA-1: 43f89ddc34ffbc9341081d9abae38db8ed3d1f4b SHA-256: 85b013346b0bbaff2955886c94cb5eafe2c530099478d748c21502f4c3ae3f00
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b977788127---16044205611.pdf
    • https://tipresentoio.it/images/file/busugetalo.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161477c0ceb6af---67892120845.pdf
    • http://frutapac.com/ckfinder/userfiles/files/danij.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/katukarodekexukejogi.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131a5a6dc891---49117669285.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b21b79550d---23102553399.pdf
    • https://icbacademy.com/upload/files/dumofipozazusukori.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/7f0513e0dbc9f52152fb72ae3bb63089/wisoselifudugavijudivip.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5fc33e8a2---vomob.pdf
    • http://ckm-machinery.com/userfiles/files/givosolevijusofixumudavi.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/26117622338.pdf
    • https://motodubai.com/uploaded_images/files/30651679262.pdf
    • http://cokhihoaiduc.com/uploads/files/pilit.pdf
    • http://protezas.lt/i/File/18108525612.pdf
    • http://eiffelflowersquesnel.com/userfiles/file/fizuxilubenunuwe.pdf
    • http://ingmarcofaedi.com/userfiles/files/fonoralofezimorunepe.pdf
    • http://engineersclasses4competition.com/files/others/dosudomuzadutizeko.pdf
    • http://bbdecontra.com/userfiles/files/49075809083.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/mimipopajivitubapajisebus.pdf
    • http://shannonlakeestates.org/fck_images/file/26007601383.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3dc97d79---32426592598.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e8739d4fdc1ae10e8abdcc3bc68180c5/lorufobig.pdf
    • http://architects-desk.com/uploadsfile/nugufibakiviwinuwilod.pdf
    • http://ipceurope.be/assets/file/12537512539.pdf
    • http://www.klimavill.com/data/editorfile/zukafabed.pdf
    • https://rrrc.us/userfiles/file/48766934684.pdf
    • https://wangwangcamp.com/uploads/files/202109181159185875.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sleep+as+android
    • 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_off0000b777.bin
97af40a46023e5fac97a29536c30340743710821839ff77e77d30be93e3dc7e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB777 10360 bytes
font_01_sfnt_off0000cee1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE1 16792 bytes
font_02_sfnt_off0000e6f3.bin
18c8c8fd619115231d116e3d2e63d88204e17e13d22960e0fea2d375915a2e3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 14804 bytes