Malicious PDF — malware analysis report

Static analysis result for SHA-256 baae4d107af20512…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 22:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f948e118a1280346695d0317758023ed SHA-1: 7d320638fd9f75236cd3420755dc5783a1201b10 SHA-256: baae4d107af205122efa38e2fdbbd1a67365e443686078afb81501075b966839
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan delivery mechanism. Multiple heuristics indicate the PDF acts as a link farm, directing users to external URLs hosted on various domains, some of which appear to be compromised or disposable. The presence of a visual download button further supports a social engineering lure to encourage user interaction and potential download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=calculadora+hp+50g+para+android PDF link annotation
    • http://daiichigroup.net/uploads/news_file/xunidakezitopa.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/11702551654.pdfIn PDF document text
    • http://ailizia.com/userfiles/5757671731.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/poxiduju.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109080909235105.pdfIn PDF document text
    • http://emeat.ru/var/files/vomitabaromopodidimurigud.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/regug.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/9448544397.pdfIn PDF document text
    • http://vuason.vn/upload/files/konajolo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e5cb56ae---kugomokajudesivunej.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/detivitegisabo.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/72406762105.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/seligiwisawigavaborifom.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/jixajirop.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1cd741e14---39432270155.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/7473836110.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/18460781993.pdfIn PDF document text
    • http://goref.ru/files/file/wososuwujuwakotigeg.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/19625931019.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/mumuwitubol.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/67869273100.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370454b0adb---7918380563.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/564196530.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_off0000dccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 20848 bytes
SHA-256: e46919e386f9e3c93d01c13046a553a80c50efc888b8ec1e2f36a7530591fcfd
font_01_sfnt_off00011385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11385 10780 bytes
SHA-256: 0cd0fc64b2babc9503228db905f882431afd416c2533d5d2becaad0601dd832a
font_02_sfnt_off00012c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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